Question

a set of data has a normal distribution with a mean of 5.1 and a standard deviation of 0.9. find the percent of data between 6.0 and 6.9.

Answer 1

5.1 +.9 = 1sd
5.1 + 1.8 = 2sd
5.1 + 2.7 = 3sd

Answer 2

the percent of data between 1 and 2 sds is about 13.5%

Answer 3

....5.1..........6.0................6.9
+.9 +1.8
| 34% | 13.5% |