Question

The scores on the GRE are normally distributed with a mean of 541 and a standard deviation of 89. Use the 68-95-99.7 rule to find the percentage of people taking the test who score between 363 and 541

Answer 1

http://www.jiskha.com/display.cgi?id=1481244211

Answer 2

for a mean of 541, with a sd of 89
we would have:
541-89 <---> 541+89 (one standard deviation)
452 <---> 630 ---------68%

452-89 <---> 630+89 (two standard deviations)
363 <---> 719 -------- 95%
since 541 is the mean
363<---> 541 would be 1/2 of 95% or 47.5%

Answer 3

Scores on the GRE​ (Graduate Record​ Examination) are normally distributed with a mean of 549 and a standard deviation of 138. Use the 68 dash 95 dash 99.7 Rule to find the percentage of people taking the test who score below 273.