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The state test scores for 12 randomly selected high school seniors are shown on the right. Assume the population is normally distibuted.
1425 1225 988
694 727 839
721 745 543
621 1449 943
a) Find the sample mean
b) Find the sample standard deviation
c.) Construct a 90% confidence interval for the population mean u.
Is there a significant difference the four testing conditions?
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Assuming the validity of this premise, among 25 randomly selected current customers, what is the probability that between 2 and 6 (inclusive) qualify for membership?
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