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The probability that a student is not a swimmer is The probability that out of students exactly are swimmer is
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a
453
b
454
c
5C4454
d
343
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Correct option is B
Let p = probability that a student selected at random is a swimmer = 1−1/5=4/5. n= number of students selected =5and X=number of swimmers Then X~B(n,p) where n=5 and p=4/5Probability that exactly 4 students are swimmer is =5C4p4q=545415=454.Similar Questions
If for a Binomial distribution the mean is 10 and the standard deviation is
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