An instructor finds that the grades in one of his classes tend to have a distribution on the interval [50, 100] with pdf(x) = (3/31250)(x-75).1. What

An instructor finds that the grades in one of his classes tend to have a distribution on the interval [50, 100] with pdf(x) = (3/31250)(x-75).1. What is the probability that student makes a B, i.e. between 80 and 90?2. What are the mean and standard deviation of the grade distribution?

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