Correct Answer - Option 2 : 10/3
GIVEN:
Triangular number = n(n + 1)/2 where n = 1, 2, 3
FORMULA USED:
Mean = sum of all the data/ Total number
CALCULATION:
When n = 1, 2 , 3 then triangular number = 1, 3 and 6
⇒ Mean = summation of all the number/Total number
⇒ Mean = (1 + 3 + 6)/3
∴ Mean = 10/3
