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Mean can be calculated by taking the average of the maximum and the minimum numbers.

Mean = (45 + 65) / 2 = 110/2. So, Mean = 55kg

68% is 1 standard deviation on either side of the Mean.

So, 2 total standard deviations on the Bell curve!

This is the Empirical Rule.

Hence, 1 Standard Deviation = (65 – 45)/ 2 = 20/2 = 10

1 Standard Deviation = 10kg

Mean can be calculated by taking the average of the maximum and the minimum numbers.

Mean = (94 + 76) / 2 = 170/2 = 85

Mean = 85points.

99.7% is 3 standard deviations on either side of the mean.

So, 6 total standard deviations. This is the Empirical Rule.

Hence, 1 Standard Deviation = (94 – 76)/6 = 18/6 = 3

1 Standard Deviation = 3points.