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gayaneshka [121]

4 years ago

14

On a normal distribution of iq test scores, with a mean of 100 and a stadard deviation of 15 points, a score of 70 would place y

ou in approximately what percentile of the population?

1 answer:

Romashka-Z-Leto [24]4 years ago

4 0

(70 -100)/15 = -2 . . . . the z-score of a score of 70

p(z < -2) ≈ 2.3%

A score of 70 would place you in approximately the 2nd percentile.

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Find the length and width of a rectangle that has the given perimeter and a maximum area. perimeter: 244 meters

MissTica

We know that

[perimeter of rectangle]=2*(<span>length+width)
</span>
Let
x-----------> length
y-----------> width
so
P=2*(x+y)-----------> 244=2*(x+y)-----> x+y=122-------> y=122-x

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find the derivative function and equals to zero

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<span>the maximum area is given by a square
</span>
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is a square of side 61 m

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