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If the length of time required by students to complete a 1-hour exam is a random variable with a pdf given by cx +

If the length of time required by students to complete a 1-hour exam is a random variable with a pdf given by cx + x if 0x1 fx(x) = LARI then what is the probability a student finishes in less than a half hour? Also, calculate the variance of this distribution. [6 MARKS] otherwise ii. If a random variable X has the probability density function (pdf) e-2 for

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