In Shiva’s opinion, his weight is greater than 65 kg but less than 72 kg. His sister does not agree with Shiva, and she thinks that Shiva’s weight is greater than 60 kg but less than 70 kg. His father’s view is that his weight cannot be greater than 68 kg. If all of them are correct in their estimation, then the average of the different probable weights (in kg) of Shiva is: