SOLUTION: Scores on the GRE (Graduate Record Examination) are normally distributed with a mean of 569 and a standard deviation of 89. Use the 68-95-99.7 Rule to find the percentage of
Algebra ->
Probability-and-statistics
-> SOLUTION: Scores on the GRE (Graduate Record Examination) are normally distributed with a mean of 569 and a standard deviation of 89. Use the 68-95-99.7 Rule to find the percentage of
Log On
Question 1139862: Scores on the GRE (Graduate Record Examination) are normally distributed with a mean of 569 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 391 and 747.
The percentage of people taking the test who score
between 391 and 747 is __ %? Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! z=(x-mean)/sd
so (391-569)/89=-178/89=-2
and (747-569)/89=178/89=+2
That is the percentage between -2 and +2 sd, which empirically is 95%
