Top Management at a Large Software Company Wishes to Estimate

Multiple Choice

Top management at a large software company wishes to estimate the average number of hours its firm's professional employees volunteer in the local community.Based on past similar studies, the standard deviation was found to be 2.22 hours.If top management wants to estimate the average number of hours volunteered per month by their professional staff to within one hour with 99% confidence, how many randomly selected professional employees would they need to sample?

A) 19
B) 25
C) 54
D) 44
E) 33