An Accounting fiRm Is Planning for the Next Tax Preparation

An accounting firm is planning for the next tax preparation season. From last year's returns, the firm
Collects a systematic random sample of 100 filings. The 100 filings showed an average preparation
Time of 90 minutes with a standard deviation of 140 minutes.
What is the probability that the mean completion time will be more than 120 minutes?

A) Approximately zero
B) 0.0832
C) 0.4168
D) 0.0162