Question: An interval( a , b )has length b a . (a) Let Z be a standard normal random variable. Find an interval( a , b

An interval(a,b)has lengthba.

(a) LetZbe a standard normal random variable. Find an interval(a,b)of minimum

length such thatP(a<Z<b)0.9.

(b) Repeat (a) with the normal random variableXNormal(10,2).

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