SOLUTION: There are 20 children in one class. Calculate the probability that exactly four of them were born on a Sunday, considering that there is an equal chance to be born on any day of th
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Question 404961: There are 20 children in one class. Calculate the probability that exactly four of them were born on a Sunday, considering that there is an equal chance to be born on any day of the week. Answer by sudhanshu_kmr(1152) (Show Source):
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using binomial probability,
probability that a child born on Sunday = 1/7
probability that a child not born on Sunday = 6/7
probability that exactly 4 of 20 born on a Sunday = 20C4 * (1/7)^4 * (6/7)^16
