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please help Question 9 (5 points) 68% of all grades on a certain test were between 50 and 90. Assuming the data is normally distributed,

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Question 9 (5 points) 68% of all grades on a certain test were between 50 and 90. Assuming the data is normally distributed, what is the mean? ( 1) 76 ( 2) 72 ( 3) 70 ( 4) 88 Question 10 (5 points) 95% of the grades on a test were between 60 and 84. Assuming the data is normally distributed, what is the standard deviation of the scores? ( 1) 4 ( 2) 10 ( 3) 6 ( 4) 8

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