An accounting company is making preparations for the upcoming tax season. The company takes a systematic random survey of 100 filings from the previous year's returns. The estimated preparation time for the 100 filings was 90 minutes, with a standard deviation of 140 minutes.

What is the probability of finding a sample mean less than 80 minutes?

Multiple-choice questions

0.7625

0.0180

0.7143

0.2375