Question

if the average of three number is 19and the numbers are 18 ,9 and x find the value of x ​

Answer 1

Step-by-step explanation:

let the three numbers be 18,9 and x

we know that,

average=sum of observations/no of observations

average =18+9+x/3

average=27+x/3

given average=19

19=27+x/3

57=27+x

57-27=x

30=x

verification:

18+9+30/3

=57/3=19

Answer 2

Answer:

18+9+x =19

3

27 + x =19

3

27+ x = 19 × 3

x = 57 - 27 = 30

so 3rd no. is 30