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Maurinko [17]
3 years ago
7

The average weekly income of teachers in one school district is $750 with a standard deviation of $85. Find the percentage of te

achers earing more than $825 a week?
Mathematics
1 answer:
dalvyx [7]3 years ago
7 0
Point estimate (average) = $750
Standard deviation = $85
P(X>$825) = ?

Z = (X-mean)/Standard deviation = (825-750)/85 ≈ 0.88

From Z-table, P(X=825) = 0.8106

Therefore,
P(X>$825) = 1 - P(X=$825) = 1-0.8106 = 0.1894 = 18.94%

Percentage of teachers earning more than $825 is 18.94%.
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