Question 11 The distribution of the amount of money spent by students on textbooks in a semester is Type numbers in the boxes. approximately normal in shape with a mean of 472 and a standard deviation of 22. by Part 1: 5 points aby Part 2: 5 points According to the standard deviation rule, approximately 99.7% of the students spent between 10 points $ and $ on textbooks in a semester. Question 12 The distribution of IQ (Intelligence Quotient) is approximately normal in shape with a mean of Type numbers in the boxes. 100 and a standard deviation of 18. 10 points According to the standard deviation rule, % of people have an IQ between 64 and 136. Do not round. Question 13 The distribution of IQ (Intelligence Quotient) is approximately normal in shape with a mean of Type numbers in the boxes. 100 and a standard deviation of 12. 10 points According to the standard deviation rule, only % of people have an IQ over 124