We have been given that the standard deviation of a group of 20 scores is 15 and we are asked to find variance.
Since we know variance is square of standard deviation. In order to find out the variance of the given data we have to take the square of 15.
Therefore, our variance is 225.
Answer:
x=1/15 y = -4 1/3
Step-by-step explanation:
First combine like terms.
-3y = 13
y= -13/3
y= -4 1/3
Substitute for y in next equation
-4 1/3 = 5x - 4
5x = 4 1/3 - 4
5x = 4 1/3 - 4
5x = 1/3
x = 1/3 divided by 5
Since fractions can't be divided, multiply by the inverse
x = 1/3 times 1/5 = 1/15
Answer:
b=−m^3r+m^3t
Step-by-step explanation:
Considering the opposite of the rational number -1/2, the location of the snail is represented by the number 1/2.
<h3>What is the missing information?</h3>
This problem is incomplete, but researching it on a search engine, we have that:
- The fish is located at -1/2 feet.
- The snail is located at the opposite location of the fish.
<h3>What is the opposite of a rational number?</h3>
The opposite of a rational number a is given by -a, that is, it is the number with the opposite signal.
Hence, the <u>opposite of -1/2 is 1/2</u>, and the location of the snail is represented by the number 1/2.
More can be learned about rational numbers at brainly.com/question/13325494
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The surface area of the cone rounded to the nearest whole number is; 346 cm²
<h3>How to determine the cone surface area?</h3>
We are given the parameters:
Radius; r = 5 cm
Slant height; l = 17 cm
The surface area is gotten from the formula;
A = πr(r +l)
Plug in the relevant values to get;
A = 3.14 × 5 × (5 + 17)
A = 345.5 square centimeters
Approximating to a whole number gives;
A = 346 square centimeters
Thus, the surface area of the cone is 346 square centimeters
Read more about surface area of cone at; brainly.com/question/6613758
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