Question

A1. The probability distribution of the number of call-outs made by an ambulance driver during a single shift is given by

(a) Find the probability that on a randomly selected shift the driver performs 4 or more call-outs. (b) Show that the mean number of call-outs in a shift is 2.25. (c) Find the probability that in a given shift the number of call-outs is less than the mean number of call-outs.

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