Question in statistics URGENT PLEASE

Posted on 2014-04-03 10:50:00 in Engineering by MOHAMED

Engineering colleges require applicants for Masters programs to take a

general admissions test. Assume that the average score last year was 498,

with a standard deviation of 77. Assume that scores are normally

distributed.





What are the limits of scores such that 90% scored within this range

and the limits are symmetrical about the mean?





Please help me know how to solve it. I know the final answer (371,625) but I need to know how did we get it.

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