Question

If arithmetic mean of 5,10,15,R 20,35,40, is 21 then the value of R will be​

Answer 1

Answer:

22

Step-by-step explanation:

(5+10+15+R+20+35+40)/7 = 21

(125+R) = 21*7

R = 147-125 = 22

Answer 2

The value of R is "22".

Step-by-step explanation:

Given,

The arithmetic mean = 21

To find, the value of R = ?

The given observations are:

5, 10, 15, R, 20, 35 and 40.

Total number of observations = 7

We know that,

Arithmetic mean $\dfrac{Sum of all observations}{Total number of observations}$

⇒ $\dfrac{5+10+15+R+20+35+40}{7} =21$

⇒$125+R=21\times 7=147$

⇒$125+R=147$

⇒$R= 147-125=22$

⇒$R=22$

Hence, the value of R is "22".