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netineya [11]
3 years ago
14

Can you help me out with this ​

Mathematics
1 answer:
GalinKa [24]3 years ago
3 0

Step-by-step explanation:

What's the expression?

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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

6 0
3 years ago
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A party tent is used for an outdoor event. Ropes of equal length support each tent pole. The angle the rope makes with the floor
Virty [35]
Law of sines can be used to solve this problem:

(note - let x represent the missing side length.)

1. set up proportion.
sin 90°/25 = sin 55<span>°/x

2. solve.
(x) sin 90</span>° = (25) sin 55<span>°

(x) sin 90 </span>°/sin 90° = (25) sin 55° / sin 90<span>°
</span>
x = 20.4788011072
rounded to nearest tenth = 20.5 
8 0
3 years ago
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your coach assigned 15 practice exercises. You completed 6 exercises last week and 3 exercises this week. What fraction of the 1
Lorico [155]
You completed 9/15 of the exercises! :D
8 0
3 years ago
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What is the area, in square inches, of the rectangle? Show your work!!
erma4kov [3.2K]

Answer:

\huge\boxed{\sf 7 \frac{13}{20} \ in. ^2}

Step-by-step explanation:

Length of the rectangle = \displaystyle 2 \frac{1}{4} = \frac{9}{4} \ in.

Width of the rectangle =  \displaystyle 3 \frac{2}{5} = \frac{17}{5} \ in.

<u>Area of the rectangle:</u>

= Length × Width

\displaystyle = \frac{9}{4} \times \frac{17}{5} \\\\= \frac{9 \times 17}{4 \times 5} \\\\= \frac{153}{20} \\\\= 7 \frac{13}{20} \ in.^2\\\\\rule[225]{225}{2}

4 0
2 years ago
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In an earlier lesson, you saw the equation `V+F-2=E`, which relates the number of vertices, faces, and edges in a Platonic solid
Temka [501]

Answer: v= 32-f

Step-by-step explanation: hope this helps! Have a good day!

6 0
3 years ago
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