A Student Asked a Statistics Professor If Grades Were Marked

question 90

Multiple Choice

A student asked a statistics professor if grades were marked "on the curve." The professor decided to give the student a project to determine if last year's statistics grades were normally distributed. The professor told the student that last year's mean mark was 70 with a standard deviation of 10 and to use the following results. What is the expected number of grades above B?

• A) 18.25
• B) 20.00
• C) 13.59
• D) 15.87
• E) 15.63

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