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Veseljchak [2.6K]

3 years ago

15

Scores on an exam are normally distributed with a mean of 76 and a standard deviation of 10. In a group of 230 tests, how many s

tudents score within one standard deviation of the mean?

1 answer:

kirza4 [7]3 years ago

7 0

I think its 156.4, based on the 68% rule

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How to do this question plz answer me step by step plzz plz

faust18 [17]

$\text{Find the perimeter of the track field}\\\\\text{We already have one of our outside value, 50. We can multiply}\\\text{this by 2}\\\\50\cdot2=100\\\\\text{Now we need to find the perimeter, better known as the circumference}\\\text{of the half circle}\\\\\text{Since there is two half circles, we can make one}\\\text{whole circle}\\\text{Use the equation:}\\\\C=\pi \cdot d\\\\\text{Plug in and solve:}\\\\C=\pi \cdot 30\\\\C=94.24778\\\\$

$\text{Add 100 and 94.24778}\\\\100+94.24778= 194.24778\\\\\text{Round to the nearest hundredths place:}\\\\\boxed{\text{194.25 m}}$

6 0

3 years ago

Exponet for 13 ·13·13·13

photoshop1234 [79]

The exponent for that would be 13^3.

If the answer is incorrect, then i am sorry.

6 0

3 years ago

Read 2 more answers

WILLL MARK BRAINLIST......<br> 4.71 x 0.2 I NEED STEP BY STEP ON HOW TO SOLVE

OverLord2011 [107]

Answer:

Put 4.71 over 0.2 and make sure to line up the decimal.

4.71

<u>x 0.2</u>

.542

Step-by-step explanation:

8 0

3 years ago

Which statement is true about the difference 2 square root of 7 − square root of 28 ?

boyakko [2]

I'll go slow:

$2\sqrt 7 - \sqrt{28}$

$=2 \sqrt 7 - \sqrt{4 \cdot 7}$

$=2 \sqrt 7 - \sqrt{4} \cdot \sqrt{7}$

$=2 \sqrt7 - 2 \sqrt 7$

$=0$

Answer: B rational and equal to 0.

5 0

2 years ago

Factor completely.<br> 4x^2 - 1

SVEN [57.7K]

The answer should be on Photomath

6 0

3 years ago