SOLUTION: Amy and Molly go to three parties the night before graduation. For where they live, the time spent at any party follows a normal distribution with a mean of 35 minutes and a stand

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Question 1143647: Amy and Molly go to three parties the night before graduation. For where they live, the time
spent at any party follows a normal distribution with a mean of 35 minutes and a standard
deviation of 10 minutes. What is the probability that they stay at the first party for more than 31
minutes?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
z=(x-mean)/sd
z>(31-35)/10
z>-0.4
probability is 0.6554