Estimating sampling distribution of sample mean

Reference no: EM1394198

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 standard error of the mean?

a.14 minutes
b. 140 minutes
c. 1.4 minutes
d. 90 minutes

Reference no: EM1394198

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