What proportion of a normal distribution is within one stand

What proportion of a normal distribution is within one standard deviation of the mean? (b) What proportion is more than 2.0 standard deviations from the mean? (c) What proportion is between 1.25 and 2.1 standard deviations above the mean?

Solution

What proportion of a normal distribution is within one standard deviation of the mean?

0.68 proportion of all scores in a normally-distributed set of data will fall within