Please answer max 10 min, I have a test.

Mathematics

1 answer:

larisa86 [58]3 years ago

7 0

Step-by-step explanation:

floor = 12*10= 120 sq ft

rug = r² = 9 Пr2

120-9π = 91.74 sq ft

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Consider a set of 7500 scores on a national test whose score is known to be distributed normally with a mean of 510 and a standa

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$\mathbb P(X>600)=\mathbb P\left(\dfrac{X-510}{85}>\dfrac{600-510}{85}\right)=\mathbb P(Z>1.059)\approx0.145$

So approximately 14.5% of the scores are higher than 600. This means in a sample of 7500, one could expect to see $0.145\times7500\approx10.86$ scores above 600.