Answer:
I believe the answer to question (a) is 3085 ft and for (b) i think it's 238 ft
Answer:
hi how are you
Step-by-step explanation:
The local authorities in a certain city install 10,000 electric lamps in the streets of the city. If these lamps have an average life of 1000 burning hours with a standard deviation of 200 hours, assuming normal distribution, what number of lights might expected
Step-by-step explanation:
It is given:
[tex]\mu=1000[/tex], [tex]\sigma=200[/tex]
Let x be the random variable that denotes the number of hours the lamp lights up.
what number of lights might expected to fail in the first 800 burning hours
Answer: We are required to find the expected number of lights to fail in the first 800 burning hours.
First, we have to find the probability as:
P(Z < 800)
Using the z-score formula, we have:
Using the z-score formula, we have:
[tex]P(x <800)=P \left(z<\frac{800-1000}{200} \right )[/tex]
=P(z<-1)
Now using the standard normal table, we have:
P(x<800)=P(z<-1)=0.1587
Therefore, the expected number of lights to fail in the first 800 burning hours is:
[tex]\boldsymbol{0.1587 \times 10000=1587}[/tex]
After how many burning hours 10% of the lamps would be still burning?
We first need to find the z-value corresponding to area = 1- 0.10 = 0.90. Using the standard normal table, we have:
z(0.90)=1.28
Now using the z-score formula, we have:
[tex]z= \frac{x-\mu}{\sigma}[/tex]
[tex]1.28= \frac{x-1000}{200}[/tex]
[tex]1.28 \times 200= x-1000[/tex]
[tex]256= x-1000[/tex]
x= 1000+256
[tex]\boldsymbol{x= 1256 }[/tex]
Using the Zscore principle, the number of bulbs expected to Fail in the first 800 burning hours is 1587
Given the Parameters :
σ = 200μ = 1000x = 800The number of Lamps that might be expected to fail in the first 800 burning hours :
Recall:
Zscore = (x - μ) ÷ σZscore = (800 - 1000) / 200 = -1
Using the normal distribution table :
P(Z < -1) = 0.15866
The number of bulbs expected to fail :
P × total number of bulbs0.15866 × 10000 = 1586.6
Hence, 1587 bulbs are expected to fail in the first 800 burning hours.
Learn more : https://brainly.com/question/25226377
Paul is thinking of a number.
He says.
"My number is odd. It is a factor of 18 and a multiple of 3"
There are two possible numbers Paul can be thinking of
Write down these two numbers.
[tex]\\ \leq \beta \alpha \alpha[/tex]
IF CORRECT I WILL GIVE BRAINLIEST!!
Please help me do this problem!
Screenshot below!
Answer:
9
Step-by-step explanation:
will mark brainliest if the answer is correct
Answer:
Kennedy will earn 21.7 dollars per hour.
11 Select the correct answer. A basketball team played 15 games and won 80% of them. If the team expects to play 30 games in all how many more games must it win to finish the season with a 90% winning percentage? СА. 12. 00 14 15 OD. 27
Step-by-step explanation:
They need to play 15 more games
Indicate whether the following congruence statement is true or false.
50 points
Step-by-step explanation:
Since line NL is not necessarily congruent to MQ (labelled with different congruent marks), triangle NLM is not congruent to triangle MQP.
Instead, triangles NLM and QPM are congruent.
This could true because of the markings of the triangles' sides and angles are in the same location.
But the statement labeled the lines wrong which makes them False
10x + 3 - 4x - 7 how do u solve this
Answer:
The answer is 6x-4 if you need to combine the like terms.
Step-by-step explanation:
So first you see if there are any like terms so I see 10x and -4x so I add them together and get 6x. I look for other like terms and find 3 and -7 and add those together so I get -4. Then you combine the 2 answers and get 6x-4. I hope this helps you! If you need any other help please let me know in the comments.
Answer:
6x-4
Step-by-step explanation:
I need help please I have to finish this
Helppppppppppppppppp ASAP
Answer:
Option c - 2x + 1
Step-by-step explanation:
6x^2 - 10x +3x - 5
2x(3x-5) +1 (3x - 5)
(2x+1) (3x-5)
4.23m 4.27m 3.98m his longest jump was how much longer compared to his shortest jump
Answer:
.29
Step-by-step explanation: Subtract first by last
Answer:
0.29m longer
Step-by-step explanation:
Longest jump = 4.27m
Shortest jump = 3.98m
4.27 - 3.98 = 0.29m
Solve the equation
[tex]-6 = x/8 + 4[/tex]
Answer:
You want to isolate for x -6= x/8+4Subtract 4
-10=1/8* x
Divide by 1/8
x= -80
Please rate positively and give brainlist!
Answer:
x = -80
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightEquality Properties
Step-by-step explanation:
Step 1: Define
-6 = x/8 + 4
Step 2: Solve for x
Subtract 4 on both sides: -10 = x/8Multiply 8 on both sides: -80 = xRewrite: x = -80The terminal point of Dis ( 1/2,3/2). What is cos 0?
O A. V 3
B. V3
Coc.
o D. V
SUBMIT
Answer:
(c). [tex]\frac{1}{2}[/tex]
Step-by-step explanation:
The cosine is the "x" coordinate of the terminal point on the unit circle.
Thus the answer is (c). [tex]\frac{1}{2}[/tex]
as a graded class activity, your teacher asks your class to reflect a triangle across the y-axis and then across the x-axis. Your classmate gets upset because he reversed the order of these reflections and thinks he will have to start over. What can you say to your classmate to help him?
Answer:
Both processes will yield same results and he need not worry
Step-by-step explanation:
Let us firstly check if we will have same results on both steps
y before x
Let us have the point (x,y) on the triangle
y reflection
(-x,y)
then x reflection
(-x,-y)
Let us now get the order in which my friend followed
x reflection
(x, -y)
y reflection
(-x,-y)
we can see that both processes have same results and thus, my friend need not worry
Answer:
The order of these two reflections
does not
matter. The resulting image
is
the same for a reflection in the y-axis followed by a reflection in the x-axis as for a reflection in the x-axis followed by a reflection in the y-axis.
Step-by-step explanation:
PLZZZ HELP!?!?!Graph the linear equation y=2x+4. Then identify the x-intercept.
Answer:
x= -2
Step-by-step explanation:
To graph it. You know that the slope(m) is 2 and y-int is 4.
So put a point on (0, 4), (1, 6) and (0, 2) then use your ruler and just draw a straight line hitting all these points.
Ex.
When x=1
y=2x+4
y=2(1)+4
y=6
(1, 6) is a point
To solve for x-int, make y=0 because it's on the x-axis
y=2x+4
0=2x+4
-4=2x
x=-2
Answer: x intercept= (-2,0)
y intercept= (0,4)
Step-by-step explanation:
ms.watson earns more than $24 per hour. The inequalit x>24 represent the situation.which statement best represent the solution of the inequality
Answer:
All rational numbers greater than 24
Step-by-step explanation:
Which is the correct answer?
Note: ( if you give me a silly or absurd answer I will report you )
Answer:
A
Step-by-step explanation:
you take the f(x) and make it negative because it's positive
you make -x^3 positive because it's negative
you make -9 positive because it's negative
hope this helps!
QUICK PLS ASSESSMENT ENDS IN 30 mins
The lengths of nails produced by a machine are known to be distributed normally
with mean u mm and standard deviation 0.7 mm. The lengths, in mm, of a
random sample of 5 nails are 107.29, 106.56, 105.94, 106.99, 106.47.
Calculate the 80% confidence interval for u.
Answer:
69
Step-by-step explanation:
50mgs for every 60lbs how much mgs for 110 lbs
Answer:
would it be 40?
Step-by-step explanation:
Answer:
The answer is either 1.0022727272727274, 40, or 1.8375000000000001.
Hope this helps, have a wonderful day/night, stay safe, happy holidays, and merry christmas!
The elves and reindeer are getting ready for a meeting with Santa.
So far 14 of them have arrived.
If they have 38 legs between them, how many reindeer are at the meeting and how many elves are at the meeting?
Let [tex]e[/tex] and [tex]r[/tex] be the number of elves and reindeers, respectively.
We know that:
[tex]r+e=14[/tex] (so far 14 of them have arrived)
[tex]4r+2e = 38[/tex](each reindeer has 4 legs and each elf has two)
If we multiply the first equation by 2 we have [tex]2r+2e=28[/tex], and if we subtract this equation from the second we have [tex]2r=10[/tex] which implies [tex]r=5[/tex].
So, there are 5 reindeers and 9 elves (remember that they have to sum up to 14).
The number of reindeers is 5 and the number of elves is 9.
Two equations can be derived from the equation:
e + r = 14 equation 1
2e + 4r = 38 equation 2
Where:
e = number of elves at the meeting
r = number of reindeers at the meeting
In order to determine the value of r, multiply equation 1 by 2.
2e + 2r = 28 equation 3
Subtract equation 3 from 2
2r = 10
Divide both sides of the equation by 2
r = 5
To solve for e substitute for r in equation 1
5 + e = 14
e = 14 - 5
e = 9
A similar question was answered here: brainly.com/question/23589883?referrer=
Find the missing angle.
Answer: 80
Step-by-step explanation:
Total amount in a triangle is 180
180 - 80 - 20 = 80
Find the slope of the line.
(6, 10)
3
(a, 8)
(4, b)
(2, 2)
Answer:161500
Step-by-step explanation:that's your answer
Hayden plans to take a loan out to buy his Ultimate PC
Gaming Desktop. He will borrow $6,200 from the bank
at a rate of 3.5% annually. The length of the loan will be
5 years. How much interest will Hayden have to pay on
the loan? What is the total that Hayden will have to pay
the bank back?
Give step by step plz
Answer:
The rate of simple interest for loan was 8%
Step-by-step explanation:
Given
Principal amount = p = $6200
Time = t = 1 year
Amount after interest = $6696
We have to calculate the amount of interest first
So,
Interest amount =I= Amount after interest - principal amount
= 6696-6200
=$496
The formula for simple interest is:
The rate of simple interest for loan was 8%
Keywords: Simple interest, percentage
Learn more about simple interest at:
Suppose that 7 in every 10 auto accidents involve a single vehicle. If 15 auto accidents are randomly selected, compute the probability that at most 4 of them involve a single vehicle.
Answer:
[tex]\mathbf{P(X \le 4 ) \simeq 0.0006722}[/tex]
Step-by-step explanation:
From the information given:
p = x/n
p = 7/10
p = 0.7
sample size n = 15
Suppose X be the number of accidents involved by a single-vehicle.
Then;
[tex]X \sim Binom (15,0.7)[/tex]
Thus, the required probability that at most 4 involve in a single-vehicle is
[tex]P(X\le 4) \\ \\P(X \le 4) = P(X = 0) + P(X =1 ) + ... + P(X = 4)[/tex]
[tex]P(X \le 4 ) = (^{15}_0) *0.7^0 *0.3^{15-0} + (^{15}_1) *0.7^1 *0.3^{15-1} + (^{15}_2) *0.7^2 *0.3^{15-2} + (^{15}_3) *0.7^3 *0.3^{15-3} + (^{15}_4) *0.7^4 *0.3^{15-4}[/tex]
[tex]P(X \le 4 ) = (\dfrac{15!}{0!(15-0)!}) *0.7^0 *0.3^{15-0} + (\dfrac{15!}{1!(15-1)!}) *0.7^1 *0.3^{15-1} + (\dfrac{15!}{2!(15-2)!}) *0.7^2 *0.3^{15-2} + (\dfrac{15!}{3!(15-3)!}) *0.7^3 *0.3^{15-3} + (\dfrac{15!}{4!(15-4)!}) *0.7^4 *0.3^{15-4}[/tex]
[tex]P(X \le 4 ) =1.4348907 \times 10^{-8} +5.02211745 \times 10^{-7} + 8.20279183 \times 10^{-6} + 8.29393397 \times 10^{-5} + 5.80575378 \times 10^{-4}[/tex]
[tex]P(X \le 4 ) =6.7223407 \times 10^{-4}[/tex]
[tex]\mathbf{P(X \le 4 ) \simeq 0.0006722}[/tex]
I need help!!!!!!!!!!!!
Answer:
NO they are not proportional
Step-by-step explanation:
52.3/3=62.45/5 Lets see if that is correct.
52.3/3 is 17.433333333
62.45/5 is 12.49.
No they are not the same
Hope this helps plz hit the crown :D
Is 3x + 4 proportional? Explain.
Answer:
Since it is a linear function, it is a directly proportional function
Step-by-step explanation:
i looked it up
9514 1404 393
Answer:
no
Step-by-step explanation:
An equation representing a proportional relationship looks like ...
y = kx
where k is the constant of proportionality. A notable feature of this equation is that its y-intercept is zero.
Your expression has a y-intercept of +4, so does not represent a proportion.
_____
Additional comment
Strictly speaking, a proportion is a statement of equality of two ratios. An expression cannot be a proportion. We interpreted your question to be ...
does y = 3x+4 express a proportional relationship?
If there are 129 apples and you take away 12, how many do you have now?
Answer:
117
Step-by-step explanation:
Answer: 129-12=117
Step-by-step explanation: 117 apples would be left.
I GIVE BRAINLIEST!!
Please explain you work!!!
The ratio of the number of boys to the number of girls in skateboard club is 5 to 4. There are 60 girls in skateboard club. How many boys are in skateboard club?
Answer:
boys:girls
5:4
?:60
multiply 15.
?=75 boys.
Hope it helps.
Answer:
Hello there.
5:4
75:60
Step-by-step explanation:
if 60/4=15, multiply 15 with 5.
your answer is 75.
Hope it helps, thank you.
The following are shoe sizes of a group of bowlers: 6.5 ,7 ,7 ,7 ,7.5, 8, 8.6, 8.5, 9, 9.6, 10.5, 11. What is the mean shoe size of the bowlers?
A. 8.5
B. 8.3
C. 8.7
D. 8.0
Answer:
8.3
Step-by-step explanation:
Add all of the shoe sizes together then divide by how many shoe sizes there are and you will get your answer