Find the Sample Size

Multiple Choice

Find the sample size.
-ABI Insurance wants to estimate the average life expectancy to within one year with
95% confidence. Previous studies have shown the mean age life expectancy of its clients
To be 78.6 with a standard deviation of 4.48 years. How many randomly selected
Recently paid policies would they need to sample to achieve the desired level of accuracy?

A) 98
B) 121
C) 54
D) 78
E) 83