Suppose adult human heights range from 42 inches to 90 inches (assuming healthy circumstances). A geneticist claims this is

Suppose adult human heights range from 42 inches to 90 inches (assuming healthy circumstances). A geneticist claims this is because 48 genes determine human height, each of which contributes 1 inch when present, to a baseline height of 42 inches. According to our geneticist, each gene has a 1/4 chance of being present in a person, and these probabilities are independent. In a random sample of 800 healthy adults then, about how many should we expect to be over 60 inches tall? Use a normal approximation.


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