Unformatted text preview: enter normalcdf(left bound, right bound, mean, standard deviation). • If you are given a probability and asked to ﬁnd a bound use 3:invNorm. If you are trying to ﬁnd a , then a =invNorm(total area under the curve to the left of a , mean, standard deviation). 1. Let Z be the standard normal variable. Find the following: (a) P ( Z ≥ 1 . 5) (b) P ( Z < 2) (c) P (1 . 5 < Z ≤ 2) 2. Let X be a normal random variable with μ = 80 and σ = 5. Find the following: (a) P ( X ≤ 70) (b) P ( X > 75) (c) P (45 ≤ X ≤ 90)...
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This note was uploaded on 03/04/2012 for the course MATH 141 taught by Professor Jillzarestky during the Fall '08 term at Texas A&M.
 Fall '08
 JillZarestky
 Probability

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