Question

18The overhead reach distances of adult females are normally distributed with a mean of 200 cm and a standard deviation of 8.9 cm.

a. Find the probability that an individual distance is greater than 210.00 cm. (Round to four decimal places as​ needed.)

b. Find the probability that the mean for 20 randomly selected distances is greater than 197.80 cm. Round to four decimal places as​ needed.)

c. Why can the normal distribution be used in part​ (b), even though the sample size does not exceed​ 30? Round to four decimal places as​ needed.)

Answer 1