% of the area under the curve of the standard normal distribution is between About 2 = -2.976 and z = 2.976 (or within 2.976 standard deviations of the mean). Submit Question

Find the indicated area under the curve of the standard normal distribution; then convert it to a percentage.  About what % of the area z=-1 and z= 1 (or within 1 standard deviation of the mean)?

Scores on an exam follow an approximately Normal distribution with a mean of 76.4 and a standard deviation of 6.1 points. What percent of students scored below 90 points?

Find the indicated area under the curve of the standard normal​ distribution; then convert it to a percentage and fill in the blank.   About​ ______% of the area is between zequals=minus−1 and zequals=1 ​(or within 1 standard deviation of the​ mean).