A study was designed to investigate the effects of two variables ​(1) a​ student's level of mathematical anxiety and​ (2) teaching method on a​ student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of with a standard deviation of on a standardized test. Assuming a​ mound-shaped and symmetric​ distribution, in what range would approximately ​% of the students​ score?

Answers

Answer 1

Answer:

Solution using the Empirical Rule, which is explained here.

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

Approximately 68% of the measures are within 1 standard deviation of the mean.

Approximately 95% of the measures are within 2 standard deviations of the mean.

Approximately 99.7% of the measures are within 3 standard deviations of the mean.

The question is incomplete, but you solve this using the Empirical Rule.


Related Questions

Billy has a set of wooden boards. Each board is 0.6 meters long. If Billy lays 4 boards end-to-end, how many meters long will the line of boards be?

Answers

Answer:

2. 4 meters long

Step-by-step explanation:

0. 6 times 4 equals 2. 4

if 1 inch equals 50 miles
what does 70 inches equal into miles?​

Answers

Answer:3500 miles

Step-by-step explanation:

1=50

meaning that we can do 70x50

which equals 3500

Answer:

3,500

Step-by-step explanation:

1in = 50 miles

70 in x 50 miles - 3,500, so therefore

70 in = 3,500 miles

hoped i helped you!

Does a hexagon contain rays

Answers

Answer:

no

Step-by-step explanation:

helopppppppppppp meeeeeeee

Answers

Answer:

The answer is B

Step-by-step explanation:

1. Given the triangle below, what is the value of sin 8
?
12
6

65

Answers

Answer:

2

Step-by-step explanation:

bc

Answer:

(2/5)√5

Step-by-step explanation:

from the sine rule (see attached for reference), we can construct the following relationship

12/sinθ  = (6√5) / sin 90°

recall that sin 90° = 1, hence our equation becomes:

12/sinθ  = (6√5) / 1

12/sinθ  = (6√5)   (rearranging)

12 ÷ (6√5)  = sin θ

sin θ = 12 / (6√5)

sin θ = 2 / √5   (moving radical to numerator by multiplying by √5/√5)

= 2 / √5     x     √5/√5

= 2√5 / 5

= (2/5)√5

A fruit salad recipe calls for 2 cups of
bananas for every 3 cups of apples. If
Shannon is using 9 cups of apples to
make fruit salad for a party, how many
cups of bananas does she need? Help me

Answers

Answer:

6 cups

Step-by-step explanation:

9 / 3 = 3

3 x 2 = 6

Hope that helps!

Answer:

6 cups of bananas

Step-by-step explanation:

there are 9 cups of apples, so 3 cups of apples need to be multiplied by three. that means you have to multiply the 2 cups of bananas by three.

Round 54.36 to the nearest tenth

Answers

Answer:

Step-by-step explanation:

54.3

Answer: 54.4

Step-by-step explanation: The 6 rounds the 3 up to 4. If it was 4 (54.4) or below it would be 54.3.

180 people walked in a store. Every 25th person got a free T-shirt. What’s the total number of people who received a t-shirt?

Answers

Answer:

the correct answer is 7

....... hope it helps you

Answer:

[tex]thank \: yo[/tex]

3x + 1/3y=12
2y=18x+72

Show all work

A no solution
B one solution
C infinity solutions

Answers

Answer:

B one solution

Step-by-step explanation:

3x + 1/3y=12

2y=18x+72; y = 18x/2 +72/2; y =9x+36

3x + 1/3y=12

multiply all through by 3

9x + y = 36

9x + 9x+36 = 36

18x =36-36= 0

x= 0/18 = 0

y =9x+36

y = 9(0) +36 = 0+36= 36

Can someone help me please!!

Answers

Answer:

the y=4 because the line is going through the y axis and the 4 and the the equation is -2x+4

Step-by-step explanation:

find the 7th term in the sequence?
-1,2,-4,8

Answers

-64 because it is timesing by -2 each time

2x+3y=5x-y2x+3y=5x−y

Answers

Here you go, please tell me if you got it right or wrong. Good luck! I’m sorry if it’s incorrect btw.

Which expression is equivalent to
(r-7)6

Answers

Answer:

6r-42

hope that help you


11 Ankitesh and his friend Jimmy together sold tickets for a charity show for
13
times as much as Jimmy sold, how much did
3
3800. If Ankitesh sold 1
each of them sell the tickets for?

Answers

Answer:

..................

Step-by-step explanation:

......

How many fifths are there in
2 1/5

a. 11 b. 10 c. 9 d. 8​

Answers

Answer:

in 2 there are 10 fifths 10 fifths + 1 fifth = 11 fifths.

Answer:

A- 11

Step-by-step explanation:

Number = 2 1/5 = 11 / 5

Fifths = 1/5

Answer = 11/5 ÷ 1/5 = 11/5 x 5/1 =11

I hope im right!!

You purchased an $85,000 home, and the property taxes were $1530. If they make improvements and the house is now valued at $130,000, what will the new property tax be? (McGraw-Hill Companies)​

Answers

Answer:

43470

Step-by-step explanation:

purchased of home =$85000

improvement of home =1530=

85000

+1530

=86530

the valued of home =130000=

130000

-86530=

43470

100 points if u help

Answers

The answer is 87.12

Just check it once

Answer:

87.92

that is the answer

3.14(4^2+12)

this is how it looks in normal form without a and b

4^2 is going to be 16

16+12= 28

3.14 times 28= 87.92

Step-by-step explanation:

Triangle with sides of 7 and 9. What is the longest length the third side can be?​

Answers

Answer:

7

Step-by-step explanation:

A line includes the points (8,5) and (9, – 5). What is its equation in point-slope form?

Answers

Answer:

Step-by-step explanation:

slope = [tex]\frac{y_{2}-y_{1}}{x_{2}-x_{1}}[/tex]

         [tex]=\frac{-5-5}{9-8}\\\\=\frac{-10}{1}\\\\=-10\\[/tex]

Point-slope form:

y - y1 = m(x - x1)

y - 5 = -10(x - 8)

Look at the picture for answer choices

Answers

Its A, the first one

If I have an equation like 6+3y-4 can i move the 3y to the back to deal with the 6 and the -4?
ex: 6-4+3y?

Answers

Yes as long as you keep the sign in front of it

Question 1 of 10
Suppose a normal distribution has a mean of 266 and a standard deviation of
12. What is P(x> 242)?
O A. 0.16
B. 0.475
C. 0.84
D. 0.975

Answers

0.975 is P(x ≥242) with a mean of 266 and standard deviation of 12

The required value of P(x> 242) = is 0.975 for normal distribution. Option D is correct.

The normal distribution has a mean of 266 and a standard deviation of

12. What is P(x> 242) is to determine.

Whata  is normal distribution?

Normal distributions can be altered to standard normal distributions by the formula:

Z = (X - μ)/σ

Where x is a value from the initial normal distribution, μ is the mean of the initial normal distribution, and σ is the standard deviation of the initial normal distribution. The standard normal distribution is periodically called the z distribution.

Now,
z = X - 266 /12
p(x > 242) = P [(X - 266)/12 ≥ (242 - 266)/12]
p(x > 242) = P [z ≥ -24/12]
p(x > 242) = P [z ≥ -2]
p(x > 242) = P [z ≤ 2]
p(x > 242) = 0.975  (from Z table).


Thus, the required value of P(x> 242) = is 0.975. Option D is correct.


Learn more about normal distribution here:
https://brainly.com/question/12421652

#SPJ2

plz help ill mark you brainliest too

Answers

Answer: I see you have already marked most of these correctly, the permiter of #4 is 28

Step-by-step explanation:

6: Perimeter: 34 Area: 60

7: 340 / 17 Length of base = 20

8: 221 / 17 Length of base = 13

an expression in simplest form pls

Answers

Answer:

(2a)3

Step-by-step explanation:

Hopes This Helps!!

Mr. Lenz has received several orders for apples at his farm
stand. He needs to know how many people ordered 12
apples so he can fill bags of 12.
Would a dot plot or a histogram be a more appropriate way to display the
data for this situation?
A. A histogram, because Mr. Lenz wants to know all of the data for a
single value
O B. A dot plot, because Mr. Lenz wants to know all of the data for a
single value.
C. A histogram, because Mr. Lenz wants to know how the data fall
into different intervals or ranges.
D. A dot plot, because Mr. Lenz wants to know how the data fall into
different intervals or ranges.

Answers

Answer:

A, Histograms give values where as dot plots are focused on a trend.

Answer:

B

Step-by-step explanation:

I got the test

1) Jorge takes his friends out for smoothies. He buys 5 smoothies and leaves a $3 tip,
paying a total of $23. He wants to know the price of one smoothie.
• price of 5 smoothies: 23 – 3 = 20
1) Which equation shows how to find the price of one smoothie?
20 – 5 = 15
20 : 5 = 4
23 : 5 = 4.60
23 - 5 = 18

Answers

Answer:

15b-x=4

Step-by-step explanation:

i am a smart teacher

It the end of the day l need this last one

Answers

The correct answer choice is B

camie and jorge each saving money for a new computer camie saves $5 per week plus $50 she received for her birthday. jorge saves $7 per week. which of the following can be used to find w the number of weeks until jeorge has saved at least the same amount as camie​

Answers

Answer:

7w > 5w + 50

Step-by-step explanation:

I need some help with this​

Answers

Answer:

(3) Median

Step-by-step explanation:

I would say median because it most likely wouldn't be any of the others. Mean would be thrown off with the outlier 0.80. Mode wouldn't really work for this. I don't think standard deviation would work because this isn't coninuous data.

Hope it helps and is correct!

For each expression, select all equivalent expressions from the list 1. 24x - 18 A. 6(4x -3) B. 6 C. 4(6x - 4) D. 12x - 9​

Answers

23/3+1=5 so I hope this help

Answer:

A

Step-by-step explanation:

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