I NEED HELP QUICK!!!
The mean of the data set is 20 points, the standard deviation is 1.5 points, and distribution of the data values is approximately normal. Which of the following intervals represents about 95% of the data values?
A- 15.5 to 24.5 points
B- 14 to 26 points
C- 17 to 23 points
D- 18.5 to 21.5 points