Problem 4 Dr. Manuel is interested to measure the volume of air that a person can expire in one second for people 35-45 years old who live in a certain city that is located near by the ocean. He uses sample mean to estimate the mean of volume of air for this age group in the city. Assuming that the population distribution is normal with mean 2870 ml and standard deviation 420 ml. Find the range the probability of Dr. Manuel sample mean will be in the middle 19.74% of the population. 1. 957 Binom POF