The time required for a person to learn a certain task is a random variable with probability

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The time required for a person to learn a certain task is a random variable with probability density function defined by

The time required to learn the task is between 3 and 10 minutes. Find the probabilities that a randomly selected person will learn the task in the following lengths of time.
(a) Less than 4 minutes
(b) More than 5 minutes

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