auguta tech
posted by cynthia .
Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 689599.7 rule to find the following quantities:
a. Percentage of scores less than 100=50 percent
b. Relative frequency of scores less than 120= 0.34+0.135+0.0235+0.015+0.84
c. Percentage of scores less than 140
d. Percentage of scores less than 80
e. Relative frequency of scores less than 60
f. Percentage of scores greater than 120

I believe Statistics is your school subject.