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The number of users of an ATM machine has a Poisson Distribution with a mean of 5 per 10 minute interval. Find the probability of

The number of users of an ATM machine has a Poisson Distribution with a mean of 5 per 10 minute interval.

Find the probability of 26 to 28 users within a 15 minute interval.

Find the standard deviation of the number of users in 20 minutes.

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