2 years ago

The instructions for a model airplane show a scale of 1 in:

Mathematics

1 answer:

aleksandrvk [35]2 years ago

5 0

Answer:

4 in

Step-by-step explanation:

given the scale is 1 in : 36 ft , then

length of drawing = 144 ft ÷ 36 = 4 in

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QUESTION 3 of 10: Stock returns vary from year to year. The more variance a stock displays the greater the potential risk. These

Dahasolnce [82]

Answer:

The variance of these investment returns is 74

Step-by-step explanation:

Given:

Series = 10, 30, 15, 5, 20

To Find:

variance of a series = ?

Solution:

The variance of the series = $Var\left(X\right)=\sum _{i=1}^n\frac{\left(x_i-\bar{x}\right)^2}{n}$

$\bar{x} = \frac{10+30 +5+15 + 20}{5}$

$\bar{x} = \frac{80}{5}$

$\bar{x} =16$

Now $(x_i -\bar{x})^2 =$ $(10 -16)^2 + (30 -16)^2 + (5 -16)^2 +(15 -16)^2 +(20 -16)^2$

= $(-6)^2 + (14)^2 + (-11)^2 + (-1)^2+ (-4)^2$

= 36 + 196 +121 + 1+ 16

= 370

Now

$Var\left(X\right)=\frac{370}{5}$ = 74

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3 years ago

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Step-by-step explanation:

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2 years ago

Douglas is placing strings of lights around the edge of a circular patio with a diameter of 7.5 m. The lights are in lengths of

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