Round 2 decimal places.

A group of 22 statistics students at NAU recently made an average score of 69.78 on a statistics exam (standard deviation = 24.81). Assuming that the underlying distribution is normally distributed, how many students probably earned a score of 94.6 or greater? (Present your answer as number of students.)

QUESTION 9

A group of 22 statistics students at NAU recently made an average score of 69.78 on a statistics exam (standard deviation = 24.81). How many earned a score 1.69 or more standard deviation units below the mean? (Present your answer as number of students.)

QUESTION 10

A group of 22 statistics students at NAU recently made an average score of 69.78 on a statistics exam (standard deviation = 24.81).If you were in this class of 22 students, what is the probability of your making an A (A = 90 or greater) on this test?(Express your answer as a decimal proportion of 1.00.)

QUESTION 11

A group of 22 statistics students at NAU recently made an average score of 69.78 on a statistics exam (standard deviation = 24.81). What proportion of the class made at least a D but no better than a B on this test (D = 60-69; B = 80-89)? (Express your answer as a decimal proportion of 1.00.)

QUESTION 12

A group of 22 statistics students at NAU recently made an average score of 69.78 on a statistics exam (standard deviation = 24.81). How many standard deviation units is a score of 94.6 from the mean?