Question

Arithmetic mean of 20,30,*40,60 is 40. Find the value of x

Answer 1

Arithmetic Mean is the average of a given set of numbers. Arithmetic Mean is also called as Mean or Average.

Arithmetic Mean = $\dfrac{Sum\:of\:observations}{Number\:of\:observations}$


Now coming to your question

$\boxed{Questions :-}$

Arithmetic mean of 20, 30, x, 40 and 60 is 40. Find the value of x

$\boxed{Solution :-}$

To find the value of x, we will use the formula of Arithmetic Mean

Arithmetic Mean = $\dfrac{Sum\:of\:observations}{Number\:of\:observations}$

☛ 40 = $\dfrac{20 + 30 + x + 40 + 60}{5}$

☛ 40 = $\dfrac{150 + x}{5}$

☛ 40 × 5 = 150 + x

☛ 200 = 150 + x

☛ x = 200 - 150

∴ x = 50


∴ The value of x is $\underline{\underline{\textsf{50}}}$

Answer 2

Mean= 20+30+x+40+60/5

40=150+x/5

200=150+x

x=50