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A population of scores forms a normal distribution with a mean of U=80 and a standard deviation of o=10 a. What proportion of the scores

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

a. What proportion of the scores have values between 75 and 85?

b. For samples of n=4, what proportion of the samples will have means between 75 and 85?

c. For samples of n=16, what proportion of the samples will have means between 75 and 85?

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