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The highest 5 years boy in the USA approximately normal distribution with a mean of 42.40 inches and a standard deviation of 2.26, the roller coaster fits children from 36 inches and 48 inches what percentage of 5 years boy will be allowed to ride the coaster , assuming there are 4.7 million 5 years old boys in USA how many boys in USA are the right height to fit in the coaster
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