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Question: A bank recorded the number of ATM transactions made by its customers in one day. The number x of daily ATM transactions per customer can be approximated by the following probability distribution.
x P(x)0 .221 .282 .203 .124 .095 .076 .02
Find:
(i) P(X≤4)
(ii) P(2 < X ≤ 5)
(iii) Find the mean of X
(iv) Find the standard deviation of X.
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