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The length of time needed to complete a certain test is normally distributed…

The length of time needed to complete a certain test is normally distributed with mean 43 minutes and standard deviation 8 minutes. Find the probability that it will take less...

The length of time needed to complete a certain test is normally distributed with mean 43 minutes and standard deviation 8 minutes. Find the probability that it will take less than 31 minutes to complete the test.
a. 0.0334
b. 0.5000
c. 0.0668
d. 0.9666
e. 0.9332

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