Question

If mean of the data set { 10, 20, 30, x} is
20, then value of x is​

Answer 1

Answer:

20

Step-by-step explanation:

mean = 20

(10+20+30+x)/4=20

(60+x)/4=20

60+x=80

x=20

Answer 2

Answer:

The value of x = 20

Step-by-step explanation:

Given data

           mean of the data set {10, 20, 30, x } = 20

here we need to find the value of x  

we know that mean of a data = sum of the observations/No of observations          

mean of 10, 20, 30, x  = $\frac{10 + 20 + 30 + x}{4} = 20$  

                                    10+20+30+x = 80

                                              60 + x = 80

                                                       x = 20