Question

mean of 9,11,13,X,18,19 is 20 then x=..........?​

Answer 1

Step-by-step explanation:

mean=sum of all observation/total no. of observations

20=(9+11+13+X+18+19)/6

120=70+X

X=120-70=50

X=50

Answer 2

Given : mean of 9,11,13,X,18,19 is 20

To Find : Value of x

Solution:

9 , 11 , 13 , x  , 18 , 1 9

Number of data = 6

Sum of Data = 9 + 11 + 13 + x + 18 + 19

= 70 + x

Mean = (70 + x)/6

Mean = 20

Equating Both

=>  (70 + x)/6 = 20

Multiplying both sides by 6

=> 70 + x = 120

Subtracting 70 from both sides

=> x = 50

Value of x = 20

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