Question

The mean of five observations: x, x+2, x+4, x+6 and x+8 is 13. What is the value of x?

Answer 1

Mean=Sum of the observations / Total No. of observations

x+x+2+x+4+x+6+x+8/5=13
5x+20/5=13
x+4=13
x=9


Mark me brainliest

Answer 2

Here is the answer

We know that,

$\bf{mean }\: \bf{\frac{= \: Sum \: of \: all \: numbers}{total \: \: numbers}}$

Given numbers :
x , x + 2, x + 4, x + 6 and x + 8

Total numbers = 5

13 = $\bf{\frac{x +( x + 2 )+( x + 4 )+( x + 6) +( x + 8)}{5}}$

$\bf{\frac{5x + 20}{5} = 13}$

$\bf{5x + 20 = 5 \times 13} \\ \bf {5x + 20 = 65} \\ \bf{5x = 45 }\\ \bf{ x = 9}$

Hence,
The Value of x is 9.