Stats Class HELP!

Twenty-five blood samples were selected by taking every seventh blood sample from racks holding 187 blood samples from the morning draw at a medical center. The white blood count (WBC) was measured using a Coulter Counter Model S. The mean WBC was 8.636 with a standard deviation of 3.9265.
(a) Construct a 90 percent confidence interval for the true mean.
(b) Why might
normality be an issue here?
(c) What sample size would be needed for an error of ± 1.5 with
98 percent confidence?

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