The perimeter of the rectangle is 21 ft.
What is the length of the missing side.

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Ответ:

gabrielrivasgom

13.08.2020

Mathematics

$3,762.98

Step-by-step explanation:

Let's compute first the expectancy E (the expected value) of the investment:

E = 30% of 21,000 + 45% of 24,000 + 25% of 30,000 =

0.3*21,000 + 0.45*24,000 + 0.25*30,000 = $24,600

The standard deviation s is

$\bf s=\sqrt{\frac{(E-21,000)^2+(E-24,000)^2+(E-30,000)^2}{3}}$

When replacing the expectancy in this formula, we get:

$\bf s=\sqrt{\frac{(24,600-21,000)^2+(24,600-24,000)^2+(24,600-30,000)^2}{3}}=\\=3,762.978\approx \$3,762.98$

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The perimeter of the rectangle is 21 ft. What is the length of the missing side.