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1. Suppose that the checkout time at a grocery store is an exponential random variable with...

1. Suppose that the checkout time at a grocery store is an exponential random variable with mean 2 minutes. Estimate the probability that a cheker will serve more than 223 customers during an 8 hour shift.

2.

Suppose that we roll a die 205 times. What is the approximate probability that the sum of the numbers obtained is between 691 and 746, inclusive.
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