Solve the problem. Round to the nearest tenth unless indicated otherwise. Scores on a test are...

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Solve the problem. Round to the nearest tenth unless indicated otherwise. Scores on a test are normally distributed with a me

math Statistics-And-Probability

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Answer 1

Answer #1

Given, mean = $\mu$ = 70 , standard deviation = $\sigma$ = 11.5

We have to find P₈₁, which separates the bottom 81% from top 19%

0.81 0.19 P81 We have to find this value.

Using Excel function , =NORMINV( Probability , $\mu$ , $\sigma$ )

P₈₁ = NORMINV( 0.81 , 70, 11.5 ) = 80.09581 $\approx$ 80.1

P₈₁ = 80.1

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Answer 2

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