approximately normal in shape with a mean of 441 and a standard deviation of 29 According to the standard deviation rule approximately 95 of the students spent between on textbooks in a semester and Question 8 Part 1 5 points Part 2 5 points Question 9 10 points 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 13 10 points According to the standard deviation rule of people have an IQ between 61 and 139 Do not round 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