Verbal GRE exam scores are normally distributed with a mean of 497 and a standard deviation...
Verbal GRE exam scores are normally distributed with a mean of 497 and a standard deviation of 115. Use Table 8.1 to find the range covered by the middle 90% of verbal GRE scores.
Homework Answers
Solution :
From given that ,
P(
- 1.645 
< X <
+ 1.645
) = 90%
P(497 - 1.645 * 115 < X < 497 + 1.645 * 115) = 90%
P(307.825 < X < 686.175) = 90%
Range : 307.825 to 686.175
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