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Welcome to numerid.
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In the current problem, we are considering the minutes of delay, minutes of delay by a friend.
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Now, it can start from zero, like he can be zero, here she can be zero minutes late.
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That means all time.
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So, if you consider this is the lower limit and this is the upper limit, right? therefore, the pdf of x is 1 by b minus a if a lies between a to b and 0 otherwise.
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Therefore, here we will have 1 by 30 minus 0.
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It is 30 if 0 less than x less than 30, 0 otherwise.
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Now, the question that we are asked here is 15 to 20 minutes.
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It's late...