Verbal GRE exam scores are normally distributed with a mean of 497 and a standard deviation...

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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.

math Statistics-And-Probability

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Answer 1

Answer #1

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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Answer 2

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Verbal GRE exam scores are normally distributed with a mean of 497 and a standard deviation...

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