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The average time for all Economics students to complete a 120 minute midterm is 78 minutes with a standard deviation of 12 minutes.

1.  The average time for all Economics students to complete a 120 minute midterm is 78 minutes with a standard deviation of 12 minutes.

a. (2) What proportion of the students finish the midterm in 72 minutes or less?

b. (2) What proportion of students finish in 82 minutes or more?

c. (5) What proportion of students finish in between 100 and 110 minutes?

d. (2) How many minutes or less would 90% of students finish in?

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