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Tresset [83]
3 years ago
9

Why don't we measure spread about the mean by simply averaging x − x , the deviations of individual data values from their mean?

Mathematics
1 answer:
skad [1K]3 years ago
7 0

Answer:

Because this spread will add up to zero

Step-by-step explanation:

Mean defines the center of the data. Some values are below this center and some values are above this center.

For the values which are below the center (i.e. less than the mean), when mean is subtracted from these values, this results in negative numbers.

For the values which are above the center(i.e. greater than the mean), when mean is subtracted from these values, this results in positive numbers.

When these negative and positive numbers are summed together, as it is, they cancel out each other, leaving an answer equal to zero, which would be meaningless. As a spread of 0 would mean all data values are the same, when infact they aren't.

To avoid this, the difference of mean from the data value is squared, so that we can get all positive values, and then these values are added up together to calculate the spread of the data.

Conclusion:

The average of deviations of individual data from the mean will result in answer equal to zero, as a result they are squared first before finding the average.

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POZ HELP RN PLZZZZZzzzz
soldier1979 [14.2K]

Answer: It’s the third answer.

Step-by-step explanation:

There are 2.54 cm in one inch and 12 inches in one foot, so 2.54x12 = 1 foot. Multiply this by 2 to get 2 feet.

7 0
3 years ago
Don’t understand that problem
nata0808 [166]

Answer:

  (2c³ -20c² -10c) -(c² -40c +100)

Step-by-step explanation:

<u>Profit</u>

For a problem involving cost, revenue, and profit, you are expected to know that <em>profit is the difference between revenue and cost</em>. That is, if it costs you $2 to make a necklace you sell for $10, your profit is $10 -2 = $8.

<u>Problem</u>

The problem gives you polynomial expressions for revenue and cost, and asks you to combine them to make an expression for profit. In this first part, we simply show <em>how</em> we will combine them. (We presume a later part of the question will ask you to simplify the result.)

  profit = revenue - cost

Substituting the given expressions, we have ...

  profit = (2c³ -20c² -10c) -(c² -40c +100) . . . . . matches last choice

5 0
2 years ago
On a scale drawing, a building is 5.5 tall. If the scale if the drawing is 1 inch: 8 ft, how tall is the building
arsen [322]
First, since the building is 5.5 inches and the scale is 1 inch for 8 feet, you would multiply 5.5* 8 to get 44 feet.
7 0
2 years ago
Eight minus the quotient of two and a number .
spin [16.1K]
8 - (2/x)

hope this helped
6 0
2 years ago
Read 2 more answers
HLEPPPPPP!!!!!
Ksenya-84 [330]

Answer:

Solutions:-5,0,9,6

Not solutions: 12.5,10

Explanation:

The inequality that was given is:

20 > 5 + 3x

First, group similar terms;

20 - 5 < 3x

15 < 3x

x = 5

Thus, the solutions are:-3.5, 5, 4 3/4, -15

The not solutions are:-10 2/3, 129,

Hope this helps! :)

7 0
3 years ago
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