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The probability that a student is not a swimmer Is 1/5. Then the probability that out of the five students, exactly four are swimmers, is
  • a)
  • b)
  • c)
  • d)
    None of these
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The probability that a student is not a swimmer Is 1/5. Then the proba...
N=5. p=4/5 q=1/5
since p+q=1
we need 4 swimmers
from binomial distribution
ncr p^r q^n-r
5c4 (4/5)^4 (1/5)^5-4
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The probability that a student is not a swimmer Is 1/5. Then the proba...
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The probability that a student is not a swimmer Is 1/5. Then the probability that out of the five students, exactly four are swimmers, isa)b)c)d)None of theseCorrect answer is option 'C'. Can you explain this answer?
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