Converting to the standard normal random variable z, the probability statement  P(x ≥ 43.5)  is now  P(z ≥ 3.90).  Recall that the normal probability table gives area under the curve to the left of a given z value. Since we want the area to the right of  z = 3.90  and the area under the entire curve is 1, the area to the left of  z = 3.90  can be subtracted from 1. Use the table to find the probability that a student who has done their homework and attended lectures will obtain a grade of A on this test,

Managerial Economics: A Problem Solving Approach
5th Edition
ISBN:9781337106665
Author:Luke M. Froeb, Brian T. McCann, Michael R. Ward, Mike Shor
Publisher:Luke M. Froeb, Brian T. McCann, Michael R. Ward, Mike Shor
Chapter17: Making Decisions With Uncertainty
Section: Chapter Questions
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Converting to the standard normal random variable z, the probability statement 
P(x ≥ 43.5)
 is now 
P(z ≥ 3.90).
 Recall that the normal probability table gives area under the curve to the left of a given z value.
Since we want the area to the right of 
z = 3.90
 and the area under the entire curve is 1, the area to the left of 
z = 3.90
 can be subtracted from 1.
Use the table to find the probability that a student who has done their homework and attended lectures will obtain a grade of A on this test, 
P(z ≥ 3.90),
 rounding the result to four decimal places.
P(z ≥ 3.90)  =  1 − P(z ≤ 3.90)
   =  1 −  
   =   
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