Question

5 ,a,6,18,12,mean is 9 than a=
​

Answer 1

Answer:

The value of 'a' is 4.

Step-by-step explanation:

Mean = sum of all obs / no of obs

▶Total no of observation = 5

▶Mean = 9

So,

✔9 = (5 + a + 6 + 18 + 12) / 5

✔45 = 5 + a + 6 + 18 + 12

✔41 + a = 45

✔a = 45 - 41

a = 4

Answer 2

Answer:

mean = (5+a+6+18+12) /5

9 = (41+a) /5

9×5 = 41+a

45 = 41+ a

a = 45 - 41

a = 4