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A certain tennis player makes a successful first serve 79​% of the time. Suppose the tennis player serves 70 times in a match.​ What's the probability that she makes at least 59 first​ serves?

Apply the binomial formulas for mean and standard deviation. 

mu  = n*p

standard deviation = sqrt(n*p*q)

The Use the standard normal function to calculate the probability. 

probability = 1- =NORM.DIST(59,B2,B3,TRUE)  = 0.1388

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