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Question

17. I can see into the future, and find that the time it takes you guys to finish this final is normally

distributed with a mean of 93.2 minutes, and a standard deviation of 20.6 minutes.

a. If you have 140 minutes to complete this exam, what proportion of the class won't finish

in time?

b. How much time is required for the fastest 25% of the class to complete the exam?

c. What proportion of the students need between 90 and 100 minutes?

Fig: 1