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A random sample of 15...

A random sample of 15 US adults is selected.

a) Find the probability that the sample contains exactly 4 Twitter users.

b) Find the probability that at least one US adult in the sample uses Twitter.

c) Find the mean and standard deviation for the number of US adults using Twitter.Work shown please!

a) Find the probability that the sample contains exactly 4 Twitter users.

b) Find the probability that at least one US adult in the sample uses Twitter.

c) Find the mean and standard deviation for the number of US adults using Twitter.Work shown please!

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