suppose the test scores of a history class with 120 students are normally distributed with a...

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Question

suppose the test scores of a history class with 120 students are normally distributed with a mean of 78 and a standard deviation of 6

what is the probalitiy that a random student got below a 70? show work clearly

b) what is the probability that if 9 kids are selected randomly their mean score is below a 70?

c) is your answer to part b based on pop distribution, the distribution of a sample, or a sanple distribution?? explain why

math Statistics-And-Probability

Answer 1

Answer #1

Answer 2

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