For a normal curve with mean 8 and standard deviation 7, which of the following parts of the normal curve will have an area of approximately 68% of the total area?
a) from 4.5 to 11.5
b) from 1 to 15
c) from 8 to 22
d) from -2 to 14

Look up your Empirical Rule. How many standard deviations are 68%? This shouldn't be too hard to figure out. Give it a shot.

b) from 1 to 15

Look up your Empirical Rule. How many standard deviations are 68%? This shouldn't be too hard to figure out. Give it a shot.

Thanks!