(3 points) for the following data items given: 8, 10, 12, 14, 16, 18, 20 find:
mean
range
standard deviation
(2 points) intelligence quotients (iqs) on the stanford-binet intelligence test are normally distributed with a mean of 100 and a standard deviation of 16. use the 68-95-99.7 rule to find the percentage of people with iqs between 84 and 116.
(2 points) a set of data items is normally distributed with a mean of 60 and a standard deviation of 8. convert data item 72 to a z-score.
(3 points) intelligence quotients (iqs) on the stanford-binet intelligence test are normally distributed with a mean of 100 and a standard deviation of 16. intelligence quotients on the wechsler intelligence test are normally distributed with a mean of 100 and a standard deviation of 15. use z-scores to determine which person has the higher iq: an individual who scores 150 on the stanford-binet or an individual who scores 148 on the wechsler. explain your reasoning.