Statistic and Probability

Question

Suppose that pulse rates among healthy adults are normally distributed with a mean of 79 beats/minute and a standard deviation of 8 beats/minute. What proportion of healthy adults have pulse rates that are at least 89 beatsminute? Round your answer to at least four decimal places.

Answer 1

This is a z-score problem.

m = 79, sd = 8.

P(at least 89), we need to compute z score:

z = (89-79) / 8 = 5/4

P(Z > 5/4) = 0.10565