Question: For Exercises 26 and 27, check to see whether the correction factor should be used. If so, be sure to include it in the calculations.

Life expectancies. In a study of the life expectancy of 500 people in a certain geographic region, the mean age at death was 72.0 years, and the standard deviation was 5.3 years. If a sample of 50 people from this region is selected, find the probability that the mean life expectancy will be less than 70 years.