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jlopez113
21.12.2019 •
Mathematics
The probability of giving birth to a boy is 1/2. what is the probability that a family with 5 children will have at least 2 boys?
a)about 81.3%
b)about 76.9%
c)about 62.5%
d)about 90.3%
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Ответ:
0.78
Step-by-step explanation:
"The probability that a family with 5 children will have at least 2 boys" is equivalent to the complement 1 - P(family will have 1 or 0 boys).
We can use a calculator with statistical functions built in to calculate this probability. The function needed is for binomial probability: binom(n, p, x).
P(family will have 1 or 0 boys) = binomcdf(5, 0.5, {0, 1} ) produces two results: one the probab. of having 0 boys and one the probab. of having 1 boy: 0.03125 and 0.1875. We add these together, obtaining 0.21875.
Then we subtract this result from 1 to obtain The probability that a family with 5 children will have at least 2 boys: 1 - 0.21875 = 0.78125, which may be reasonably rounded off to 0.78.
Ответ:
2
Step-by-step explanation: