Question: How large a sample must be taken from a normal pdf where E(Y) = 18 in order to guarantee that has a 90% probability of

How large a sample must be taken from a normal pdf where E(Y) = 18 in order to guarantee that n =Y, = has a 90% probability of lying somewhere in the interval [16, 20]? Assume that σ = 5.0.

n =Y, =

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