Question

What percentage of the data, distributed normally and with the standard deviation, will fall within 2 standard deviations of the mean?

A)
13.5%

B)
34%

C)
68%

D)
95%

E)
99%

Answer 1

You can play around with Z table stuff here:

http://davidmlane.com/hyperstat/z_table.html

Answer 2

95