The duration of a certain task is known to be normally distributed with a mean of 7

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The duration of a certain task is known to be normally distributed with a mean of 7 days and a standard deviation of 3 days. Find the following:

a. The probability that the task can be completed in exactly 7 days

b. The probability that the task can be completed in 7 days or less

c. The probability that the task will be completed in more than 6 days

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