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at the drive thru window of a local fast food restaurant there is an 85% chance...

at the drive thru window of a local fast food restaurant there is an 85% chance that a customer will be satisfied with the service they received. Consider a random sample of 20 drive thru customers. assuming the results are independent, find the probability that

a) at least 19 of the 20 drive thru customers are satisfied with the service they received. P =

b)Calculate the mean and standard deviation of the random variable.

please show work!!

Math   Statistics-And-Probability   
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