For a certain population IQ-scores are approximately normally distributed with a mean of 97 points and a standard deviation of 16 points. (a) What is the z-score for a member of this population that has an IQ of 141? (Give your answer to two decimal places.)

(b) What is the probability that a person chosen at random from this group has an IQ in excess of 141? (Give your answer to two decimal places.)

(c) What IQ-score is at the 95th percentile? (Give your answer to two decimal places.)

(d) Find the median, quartiles and interquartile range for these IQ scores. (Give your answers to two decimal places.)
Median =
Q1 =
Q3 =
IQR =