Let x denote the lifetime (in thousands of hours) of a certain type of fan used in diesel engines. The density curve of x is as pictured below. 25 50 O (a) Shade the area under the curve corresponding to the probability that the lifetime is at least 25,000 hours, 24 50 25 25 50 @ 50 O00 26 50 O (b) Shade the area under the curve corresponding to the probability that the lifetime exceeds 25,000 hours. 24 50 25 50 50 O 25

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