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The following is a probability distribution for the time spent (minutes) by an auditor in reviewing invoices of about $10,000: Time spent: 1 minute 3

The following is a probability distribution for the time spent (minutes) by an auditor in reviewing invoices of about $10,000:

Time spent: 1 minute 3 minutes 5 minutes 10 minutes

Probability: 0.2 0.3 0.3 ?

The standard deviation of the time spent by an auditor to review one invoice is:

a) 9.24 minutes.

b) 3.64 minutes.

c) 3.04 minutes.

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