Professor elderman has given the same multiple-choice final exam in his principles of microeconomics class for many years. after examining his records from the past 10 years, he finds that the scores have a mean of 76 and a standard deviation of 12. what is the probability that a class of 15 students will have a class average greater than 70 on professor elderman’s final exam? you answered 0.6915 correct answer cannot be determined. 0.0262 0.9738

0.9738

Step-by-step explanation:

We assume that the scores follows a normal distribution.

Let denotes the class average .

As per given we have,

Sample size : n= 12

The probability that a class of 15 students will have a class average greater than 70 on Professor Elderman’s final exam will be :

Hence, the correct answer = 0.9738

75

step-by-step explanation:

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!