Please use the following information to answer questions 4a-4c:

A population of scores forms a normal distribution with a mean of= 80 and a standard deviation of= 10.

4a. What proportion of the scores have values between 75 and 85 (MUST SHOW WORK FOR THIS PROBLEM)?

Note: Bring your answer to the second decimal place.

4b.For samples ofn=4,what proportion of the samples will have means between 75 and 85 (MUST SHOW WORK FOR THIS PROBLEM)?

Note:Bring your answer to the second decimal place.

4c.For samples ofn= 16, what proportion of the samples will have means between 75 and 85(MUST SHOW WORK FOR THIS PROBLEM)?

Note: Bring your answer out to the second decimal place.