An Accounting Firm Is Planning for the Next Tax Preparation

Multiple Choice

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 a sample mean would exceed 20 hours per week?

A) 1.0
B) 0.5
C) 1.96
D) Cannot be calculated based on the given information.
E) None of the choices are correct