Hello everyone, I have found this problem on the practice quant section on the gregmat website (quant_018). It’s about standard deviation.

*At a certain restaurant, the chef prepares six varieties of soup in large pots varying from 5 to 15 litres. Each pot is full of soup.*

Qty A: The standard deviation of the quantities of soup after the chef removes 4 liters of soup from each pot.

Qty B: The standard deviation of the quantities of soup after the chef removes 5% of soup from each pot.

The answer as per website and the video lecture is A.

However, I feel the answer should be D since we can have standard deviation = 0 ( having all 6 pots of the same capacity, eg. 5 5 5 5 5 5 or 10 10 10 10 10 10). Am I correct? Or does " six varieties of soup in large pots varying from 5 to 15 litres" imply that these pots HAVE to be of distinct capacity?