The formula Sabine should use for calculating the variance and standard deviation for the random sample of bamboo stalks are,
[tex]s^2=\dfrac{(x_1-\overline x)^2(x_2-\overline x)^2...(x_n-\overline x)^2}{n-1}[/tex]
[tex]s=\sqrt{\dfrac{(x_1-\overline x)^2(x_2-\overline x)^2...(x_n-\overline x)^2}{n-1}}[/tex]
What is variance and standard deviation?The variance of the data is the measure of average level by which every point is differed from the mean.
It can be calculated as,
[tex]s^2=\dfrac{(x_1-\overline x)^2(x_2-\overline x)^2...(x_n-\overline x)^2}{n-1}[/tex]
The standard deviation of the data is the half of the difference of the highest value and mean of the data set.
It can be calculated as,
[tex]s=\sqrt{\dfrac{(x_1-\overline x)^2(x_2-\overline x)^2...(x_n-\overline x)^2}{n-1}}[/tex]
Sabine records the daily heights of a random sample of bamboo stalks, in inches.
They are: 20, 19, 17, 16, 18, 15, 20, 21
For this data Sabine wants to calculate the variance and standard deviation, which can be done using the above formula.
Hence, the formula Sabine should use for variance is,
[tex]s^2=\dfrac{(x_1-\overline x)^2(x_2-\overline x)^2...(x_n-\overline x)^2}{n-1}[/tex]
The formula should Sabine use for standard deviation,
[tex]s=\sqrt{\dfrac{(x_1-\overline x)^2(x_2-\overline x)^2...(x_n-\overline x)^2}{n-1}}[/tex]
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Answer:
First Part: A and B
Second Part: 4.5 and 2.12
Step-by-step explanation:
edge 2022
maths question vv
Answer:
Step-by-step explanation:
Let assume Polly got "x" amount of money, then Andy got "2x" and Phoebe got 3(2x)
x + 2x + 6x = 270
9x = 270
x = 30
Polly has 30 ( pound sterling )
Andy has 60 ( pound sterling )
Phoebe has 180 ( pound sterling )
Write in standard form 820000000
Answer: 8.2 x 10^8
Step-by-step explanation:
Answer:
[tex]answer[/tex]
[tex]820000000 = 8.2 \times 10 {}^{8} [/tex]
Step-by-step explanation:
hope this helps you!!!
#ITSCHOCOLOVER
-42.3 divided by 3.4
Answer:
-12.44
Step-by-step explanation:
Answer:
[tex]-\frac{423}{34}[/tex]
I hope this helps!
Which point is not on the graph of the equation
4x+2y=12
A.(-2, 10)
B.(0, 6)
C.(-5, 4)
D.(7, -8)
Answer:
-5, 4
Step-by-step explanation:
When finding the slope of all the points they all are supposed to equal -2. (-5, 4) slope is 2, so that is why it is incorrect.
Hope this helps! :)
What is the slope of the line perpendicular to the line with the equation 5x + 3y=18?
Answer:
3 i think
hope it helps...
Which graph represents a function?
Answer:
the answer is the top right one
Please help I need just 4 Correct for answers to pass
Answer:
Hey!
Your answer is 14m (2sf)
Step-by-step explanation:
WE HAVE TO USE PYTHAGORAS! ⇒ a²+b²=c² THEN √c = (unknown side)
Here: 12² + 8²= 208
Now SQUARE-ROOT 208! ⇒ √208
ANSWER: 14.42220510185596
The answers there are rounded up so we round this number to get 14m!
B IS YOUR OPTION!
I HOPE THIS HELPED YOU!Question number 2 please
Answer:
[tex]1 \frac{5}{6} [/tex]
Step-by-step explanation:
[tex] \frac{1}{6} + 1 \frac{2}{3} \\ \\ \frac{1}{6} + \frac{5}{3} \\ \\ \frac{1 + 10}{6} \\ \\ \frac{11}{6} \\ \\ = 1 \frac{5}{6} [/tex]
The right answer is not in the option smh.
Diego likes to add an 18% tip to
his restaurant check. How much
tip will he leave if his total bill is
$65.70?
Answer:
the tip would be $11.83
Step-by-step explanation:
hope that helps
A helicopter hovers 950 feet above a small island. The figure shows that the angle of depression from the helicopter to point P is 47 °. How far off the coast, to the nearest foot, is the island?
let x rep the foot of the island
Using trig formula
SOHCAHTOA
sin 47° = 950/x
xsin47° = 950
x = 950/sin47°
There are 5 crayons. Two are broken. What fraction of the crayons are not broken?.
Answer:
3/5 of the crayons are not broken since 2 are broken
The fraction of crayons that are not broken if out of 5 crayons, 2 of them being broken is 3/5
How to interpret the fraction?Suppose the fraction is proper (the numerator is smaller than the denominator).
Let it be [tex]\dfrac{a}{b}[/tex]
Then, we can interpret it as:
[tex]\dfrac{a}{b}[/tex] is "a" parts out of "b" parts of a thing.
Here, we're specified that:
5 crayons are there2 crayons are brokenThen we get:
Number of crayons that aren't broken = total crayons - number of broken crayons = 5 - 2 = 3
Thus, 3 out of 5 crayons are not broken.
Using fraction, we write it as:
[tex]\dfrac{3}{5}[/tex]
We pronounce it as "three-fifth of total crayons are not broken".
Thus, the fraction of crayons that are not broken if out of 5 crayons, 2 of them being broken is 3/5
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what is 3|(18-3)+4((5-(-7)|
Answer:
37
Step-by-step explanation:
Expand the equation
3 x (18 - 3) + 4 x (5 - 7)
Use BODMAS
First find the sum of brackets
18 - 3 = 15
3 x 15 = 45
then
5 - 7 = -2
-8
so
45 + - 8 = 37
BODMAS
B - Brackets
O - Power
D - Divison
M - Multiplication
A - Addition
S - Subtraction
Hope this helped you
:-)
Ya'll at this point I'm stressed out w this question please , I beg you help mee !!! attachment included !!
Answer:
(7,0) (9.5,0) x-axis
(0,4) y axis
(6.4, 2.7) 1st quadrant
(-3,2) 2nd quadrant
(-2.9, -4.6) 3rd quadrant
(8,-1) 4th quadrant
Step-by-step explanation:
x axis is second number 0
y axis is first number 0
1st quad is positive positive
2nd quad is negative positive
3rd quad is negative negative
4th quad is positive negative
Solve 3[-x + (2 x + 1)2 = x - 1
X=?
Answer:
x=−7/8
Step-by-step explanation:
simplify -4/5 divided by 3/-2
Answer:
[tex]\frac{8}{15}[/tex]
Step-by-step explanation:
Answer:6/36
Step-by-step explanation:
x- 4y=28 in slope intercept form
Answer:
y = -9.5 + x/4
Step-by-step explanation:
1. x-4y=38
-x -x
2. -4y= 38-x
/-4 /-4 /-4
3. y= -9.5 + x/4
The equation of a line x- 4y = 28 in slope intercept form is y = (1/4)x - 7.
What is slope?Slope can be defined as the rate of change of the y-axis with respect to the x-axis. Slope can also be thought of as rise over run which is (y₂-y₁)/(x₂-x₁).
We know the equation of a line in slope intercept form is y mx + b.
Where slope = m, y-intercept = b, and (x,y) are the points that lie on the line.
Given x - 4y = 28.
-4y = - x + 28.
4y = x - 28.
y = (1/4)x - 7.
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A store 7% sales tax.which expression can be used to find the total cost of an item with a price of p?
1.07
Step-by-step explanation:
Below. Lets say 1 is 100 dollars sale tax. If 1 is 100 7 would be 7.00
If a supplement of an angle is 20 more than 3 times a complement, then the measure of the angle is?
What steps do you need to take to solve the equation 1 2x+6=18?
A video game costs £42.
A new version of the game is released.
The price has increased by 15%.
Work out the cost of the new version. £ |
Help!!!
Answer:
48.30
Step-by-step explanation:
42(1.15) = 48.30
What is the equation of the line that goes through (-3,-1) and (3,3)?
A. 3x + 2y = 15
B. 3y + 2x = 15
C. 3x − 2y = 3
D. 2x − 3y = -3
Answer:
It’s D : 2x - 3y= -3
Step-by-step explanation: I got a 100 on the test.
i need help, what do i do?
Answer:
x = 2, y = 5.
Step-by-step explanation:
The solution is the point where the lines cross.
(2, 5)
What are the two missing terms in this number sequence: 18,33,38,48,__,63? *
Answer:
53 and 58 please give brainly
Which is a correct first step in solving the inequality –4(2x – 1) > 5 – 3x?
ANSWER: A
Answer:
>
Step-by-step explanation:
good evening! Can someone please answer this, ill give you brainliest and your earning 50 points. Would be very appreciated.
Answer:
B and D
Step-by-step explanation:
From inspection of the graph, we can see that as [tex]x[/tex] increases, [tex]f(x)[/tex] tends to 0 (gets increasingly closer to zero, but doesn't actually get there).
Therefore:
B) [tex]\textsf{as }x\rightarrow +\infty, f(x) \rightarrow 0[/tex]
From inspection of the graph, we can see that as [tex]x[/tex] decreases, [tex]f(x)[/tex] is increasing.
Therefore:
D) [tex]\textsf{as }x\rightarrow -\infty, f(x) \rightarrow +\infty[/tex]
The length of a rectangle is units greater than its width. If the width is w, which expression gives the perimeter of the rectangle in terms of its width?
A. 4w + 3
B. w – 3
C. 5w
D. 6w + 4
Answer: i got C sorry if its not right
Use picture above.
Write the ratio. Please explain what the ratio means.
1) 2:5 ratio
This is a fairly simple process, you count how many of each and then put them in order the way the question asks.
So there are 5 cans and 2 bottles. The question asks "bottles to cans" so the correct answer HAS to be 2:5, NOT 5:2.
2) 3:1
There is 1 spoon and 3 forks. The question asks "forks to spoons" so the correct answer HAS to be 3:1, NOT 1:3
Mark is painting the ceiling of a square room. If the area he paints is 400 sq. feet, what are the dimensions of the room?
Answer:
20 by 20
Step-by-step explanation:
square root of 400 is 20
20 times 20 = 400
Type A is five feet tall and grows at a rate of 12 Inches per year?
Answer: it is 5 years old
Step-by-step explanation: because 12 inches is 1 foot long and5feetis5yearsfootlongfoot
An airline sells all the tickets for a certain route at the same price. If it charges 200 dollars per ticket it sells 10,000 tickets. For every 15 dollars the ticket price is reduced, an extra thousand tickets are sold. This if the tickets are sold for 185 dollars each then 11,000 tickets sell. It costs the airline 100 dollars to fly a person. (a) Express the total profit P in terms of the number n of tickets sold. (b) Express the total profit P in terms of the price p of one ticket.
The function that gives the amount of profit at a given price and number
given are obtained from the relationship between the variables.
a) The profit in terms of the number of tickets sold, P = -0.015·n² + 250·n
(b) The profit in terms of ticket price, is P = -66.[tex]\overline 6[/tex]·p² + 3000·p + 2,333,333.[tex]\overline 3[/tex]
Reasons:
Number of tickets sold at x = $200, is y = 10,000 tickets
Number of extra tickets sold for every $15 price reduction = 1,000 tickets
Number of tickets sold at $185 = 11,000
The cost to fly a person = $100
(a) The rate of change, [tex]\frac{\Delta y}{\Delta x}[/tex], of the number of ticket sold wit price is given as
follows;
[tex]\dfrac{\Delta y}{\Delta x} = \dfrac{11,000 - 10,000}{185 - 200 } = -66. \overline 6[/tex]
The equation in slope and intercept form is therefore;
n - 11,000 = -66.[tex]\overline 6[/tex]·(p - 185)
n = -66.[tex]\overline 6[/tex]·p + 12,333.[tex]\overline 3[/tex] + 11,000 = -66.[tex]\overline 6[/tex]·p + 23,333.[tex]\overline 3[/tex]
Number of tickets sold, n = -66.[tex]\overline 6[/tex]·p + 23,333.[tex]\overline 3[/tex]
[tex]Price \ per \ ticket, \ p = \dfrac{23,333.\overline {3} - n}{66. \overline{6}}[/tex]
The revenue, R = n·x
Therefore;
[tex]R = \dfrac{23,333.\overline {3} \cdot n- n^2}{66. \overline{6}}[/tex]
The profit = Revenue - Cost
The cost = 100·n
[tex]Profit, P = \dfrac{23,333.\overline {3} \cdot n- n^2}{66. \overline{6}} - 100 \cdot n = -0.015 \cdot n^2 + 250 \cdot n[/tex]
Total profit, P = -0.015·n² + 250·n(b) The total profit, P, in terms of the price p, for one ticket
Number of tickets sold, n = -66.[tex]\overline 6[/tex]·p + 23,333.[tex]\overline 3[/tex]
The revenue, R = n·p
∴ R = -66.[tex]\overline 6[/tex]·p² + 23,333.[tex]\overline 3[/tex]·p
Cost = 100·n
∴ Cost = 100·(-66.[tex]\overline 6[/tex]·p + 23,333.[tex]\overline 3[/tex])
Therefore, the profit is given as follows;
Profit = -66.[tex]\overline 6[/tex]·p² + 23,333.[tex]\overline 3[/tex]·p - (100·(-66.[tex]\overline 6[/tex]·p + 23,333.[tex]\overline 3[/tex]))
Therefore;
Total profit, P = -66.[tex]\overline 6[/tex]·p² + 3000·p + 2,333333.[tex]\overline 3[/tex]Learn more here:
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We want to express the total profit in two different ways.
The answers are:
a) P(n) = n*[n - 23,333.3]*(-15/1,000) - n*100
b) P(p) = n(p)*p - n(p)*100 = [ (-1,000/15)*p + 23,333.3]*(p - 100)
The given information is:
If the ticket price is $200, they sell 10,000 tickets.If the ticket price decreases $15, they sell 1,000 tickets more.It costs $100 to fly a person, then the cost of each ticket is $100.a) We want to get the profit in terms of the number n of tickets sold.
The number of tickets sold depends on the price, we know that it is a linear relation like:
n(p) = a*p + b
where p is the price.
we know that:
n(200) = 10,000
n(185) = 11,000
If this is a linear relation, the slope is known:
a = -1,000/15$
Then the line is something like:
n(p) = (-1,000/15)*p + b
We know that if k = 200, then n = 10,000
Replacing that we have:
n(200) = 10,000 = (-1,000/15)*200 + b
10,000 + (1,000/15)*200 = b = 23,333.3
Then the number of tickets sold as a function of the price is:
n(p) = (-1,000/15)*p + 23,333.3
Then the revenue is given by the number of tickets sold times the price, this is:
r(n) = n*p
We can write k in terms of n as:
k = [n - 23,333.3]*(-15/1,000)
Then the revenue as a function of the number of tickets sold is:
r(n) = n*[n - 23,333.3]*(-15/1,000)
The profit is the difference between the revenue and the cost, then the profit function is:
P(n) = n*[n - 23,333.3]*(-15/1,000) - n*100
Where n*100 is the cost.
b) now we want to write the same equation, but this time as a function of the price.
now the revenue is:
r(p) = n*p = [ (-1,000/15)*p + 23,333.3]*p
Then the profit is:
P(p) = n(p)*p - n(p)*100 = [ (-1,000/15)*p + 23,333.3]*(p - 100)
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