Question

The average score on a standardized test is 500 points with a standard deviation of 50 points. If 2,000 students take the test at a local school, how many students do you expect to score between 450 and 550 points?

Answer 1

500-50=450 (-1 standard deviation(34%))
500+50=550 (+1 standard deviation(34%))
34%+34%=68%
(0.68)(2000)=1360 students