Correct Answer - Option 4 : 67 kg
Explanation:
Let Shubham’s weight be X kg.
According to Shubham, 65 < X < 72.
According to Shubham’s brother, 60 < X < 70.
According to Shubham’s mother, X < 68.
The values satisfying all the above conditions are 66 and 67.
Required average = (66 + 67 + 68)/3 = 67 kg
∴ Average of different probable weights of Shubham is 67 kg