Question: Suppose there are 81 files needed to be checked for a certain keyword.On average,it takes 15seconds to check one file,with a standard deviationof 4seconds.What is

Suppose there are 81 files needed to be checked for a certain keyword.On average,it takes 15seconds to check one file,with a standard deviationof 4seconds.What is the probability that all the files will be checked in less than 20 minutes?

Use a normal approximation without a continuity correction. Enter the probability in decimal form, rounded to four places after the decimal.

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