Suppose that a researcher is interested in estimating the mean systolic blood pressure,

, of executives of major corporations. He plans to use the blood pressures of a random sample of executives of major corporations to estimate

. Assuming that the standard deviation of the population of systolic blood pressures of executives of major corporations is

25

mm Hg, what is the minimum sample size needed for the researcher to be

95%

confident that his estimate is within

4

mm Hg of

?