Question

mean of x,3,4and5 is 3 then the value of x will be :
a)4
b)6
c)10
d)none of these
plz give proper working method too​

Answer 1

As per the data given in the above question.

we have to find the value of x.

Given ,

observations- x,3,4and 5

Mean- 3

we know that

Mean is the average of the given numbers and is calculated by dividing the sum of given numbers by the total number of numbers.

$Mean = \frac{Sum \: of \: all \: the \: observations}{Total \: number \: of \: observations}$

Put the values ,

$3 = \frac{x + 3 + 4 + 5}{4}$

$3 = \frac{12 + x}{4}$

Shift 4 toward 3 ,

$12 = 12 + x$

$x = 12 - 12$

$x = 0$

Hence,

value of x=0 and

option (d) none of these is correct.

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Answer 2

Answer:

The value of x is 0, i.e., none of these.

Step-by-step explanation:

Given - the values 3, 4, 5 and x.
             mean of the values - 3
To find - the value of x

Solution -

We know that the mean, also called the average of the numbers, can be calculated by dividing the sum of all the numbers, and the total number of the numbers, i.e.,

$Mean (\bar x) = \frac{\sum x_i}{\sum n}$
Thus, by putting the values in the formula, we get

$3 = \frac{3 + 4 + 5 + x}{4} \\\\3 = \frac{12 + x}{4}\\\\12 = 12 + x\\\\x = 0$

Therefore, because the value of x is 0, the option (d) none of these would be the right answer.

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