How do I do problems like this? " The time required to finish a test is normally distributed with a mean of 60 minutes and a standard deviation of 10 minutes. What is the probability a student will finish the test between 50 and 60 minutes?"

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You can use the standard normal distribution curve. let me see if I can find one

from http://www.oswego.edu/~srp/stats/6895997.htm
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