In a family with 2 ​children, the probability that all the children are girls is approximately 0.25. In a random sample of 1000 families with 2 ​children, what is the approximate probability that 220 or fewer will have 2 girls? Approximate a binomial distribution with a normal distribution.

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In a family with 2 ​children, the probability that all the children are girls is approximately

0.25. In a random sample of 1000 families with 2 ​children, what is the approximate probability that
220 or fewer will have 2 girls? Approximate a binomial distribution with a normal distribution.
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