What is the math definition of mean?

Mean is the number obtained by dividing the sum of all the items by the number of items.

i.e,mean= sum of all the items/the number of items

i. Mean of non-repeated data

If X represents all the items and n be the number of items,then

mean= summationX/N

ii. Mean of individual repeated data(Mean of a frequency distribution)

In the case of repeated data,follow the steps given below to calculate the mean.

- Draw a table with 3 columns.

-Write down the items(X) in ascending or descending order in the first column and the corresponding frequencies in the second column.

-Find the product of each item and it's frequency(fx) and write in the third column.

- Find the total of f column and FX column.

- Divide the sum of FX by the sum of f(total number of items),the quotient is the required mean.

There are several kinds of mean in mathematics, especially in statistics. For a data set, the arithmetic mean, also known as arithmetic average, is a central value of a finite set of numbers: specifically, the sum of the values divided by the number of values.

Hope this helped!

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option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.