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Nadya [2.5K]
3 years ago
11

Suppose the scores on a history quiz are normally distributed with a mean of 73 and a standard deviation of 4. Which group descr

ibes 16% of the population of history quiz scores?
A. scores below 65


B. scores below 75


C. scores above 77


D. scores above 81
Mathematics
1 answer:
KiRa [710]3 years ago
8 0

B is the correct answer the score is below 75

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HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Tatiana [17]
First you are going to look at the smallest box and figure out what the area is once you do that you will need to find the area of the bigger box once you figure out both of the areas you will then find out what they are you will then add up the amounts to get the area of both squares together  

6 0
2 years ago
Solve the problem by multiplying first. A clothing store is having a sale on shirts and jeans. Four shirts and two pairs of jean
ella [17]

We will solve this by suing simultaneous equations,

⇒ 5s + 3j = 87

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Multiply the first equation with 4 and the second one with 5, this is to get one of the values equal so that we can cancel them out,

⇒ (5s + 3j = 87) × 4

    (4s + 2j = 64) × 5

∴ ⇒ 20s + 12j = 348

       20s + 10j = 320

Subtract both the equations. This is how your result (after subtraction) should look like,

  ⇒ 2j = 28

∴ ⇒ j = $14

Now replace the value of 'j' in one of the original equations,

⇒ 4s + 2(14) = 64

⇒ 4s + 28 = 64

⇒ 4s = 64 - 28

⇒ 4s = 36

∴ ⇒ s = $9

Therefore, one pair of jeans cost $14 and a shirt costs $9

Hope you understood! Feel free to ask me if you didn't understand a step.

5 0
2 years ago
What is the surface area of a sphere with a radius of 11cm? Use 3.14 for pi
vagabundo [1.1K]
I hope this helps you



Area=4.pi.r^2


Area =4.3,14.11^2


Area =1519
6 0
3 years ago
What number is 25% of 4/7 <br><br> WITH WORK<br><br> ASAP
valina [46]
The answer is 1/7 and can be explained mathematically in the picture

3 0
3 years ago
Read 2 more answers
Please help, I will mark Brainliest.
Goshia [24]
It’s rational because the square root of 0.49 is 0.7
3 0
3 years ago
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