<PRE><B>Question 1034332</B>
Symmetrical function where the missing probability is 1-0.9534=0.0466
Take half of that and get 0.0233.
Now, find the z value that gives a probability of 0.0233.That occurs (use invnorm on calculator) when z=+/-1.99.
z=(x-mu)/sigma
1.99=(x-60)/15
29.85=x-60
x=89.85 or 30.15(30.15 and 89.85 days)
Check is that at 2 SDs the result would be (30,90).

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