A researcher is testing the effects of a new drug for improving memory. She tests a group of people with a high dose of the medication, another group is given a low dose of the medication, and a control group receives no medication. At the end of 3 months, she tests all three groups' memory.

Below are the memory scores for the three groups.

CONTROL LOW DOSE HIGH DOSE

60 71 80

70 65 75

55 61 85

43 79 68

What is the between-group estimate of the population variance?

Round to the nearest hundredth (two decimal places).