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Snapchat has more than 200 million daily users sending 3 billion snaps a day. Suppose that the time x between snaps you recieved is governed

Snapchat has more than 200 million daily users sending 3 billion snaps a day. Suppose that the time x between snaps you recieved is governed by exponential distribution, = 8 minutes.

For the sample of 50 times between snaps, how would you calculate the probability that the sample mean is less than 9 minutes? What does this probability indicate about the frequency of receiving snaps?

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