Mimi just started her tennis class three weeks ago On averag

Mimi just started her tennis class three weeks ago. On average, she is able to return 25% of her opponent\'s serves. Assume her opponent serves 10 times.

Solution

A)

n = 10

p = 0.25

q = 1 - p = 0.75

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b)

Note that the probability of x successes out of n trials is          
          
P(n, x) = nCx p^x (1 - p)^(n - x)          
          
where          
          
n = number of trials =    10      
p = the probability of a success =    0.25      
x = the number of successes =    0      
          
Thus, the probability is          
          
P (    0   ) =    0.056313515

Thus, P(at least one) = 1 - P(0) =   0.943686485 [ANSWER]