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The probability that a person is not a swimmer is 0.3. The probability that out of 5 persons 4 are swimmers is

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The probability that a person is not a swimmer is 0.3. The probability that out of 5 persons 4 are swimmers is A. 5C4 (0.7)4 (0.3) B. 5C1 (0.7) (0.3)4 C. 5C4 (0.7) (0.3)4 D. (0.7)4 (0.3) Select the correct answer from above options

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Total number of person , n=5 Total number of swimmers among total person , r=4 Probability of not swimmer , Q=0.3 So, The probability of swimmer , p=1-Q=0.7 We know, probability distribution P(X=r)=nCr (p)r qn-r

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