Cindy earned a score of 940 on a national achievement test. The mean test score was 850 with a standard deviation of 100. Which of the following statements is false?

a) 81.59% of the students scored lower than cindy

b) 18.41% of the students tested scored higher than Cindy

c) the Z score for Cindy is 90%

d) Cindy did better than 90% of the class