In a class test,Keith,Ethan,and Hannah score 6,4,and 8 respectively.The mean of these scores is 6. Therefore,the standard deviation of their scores is

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Quizplus · Accepted Answer

The standard deviation is calculated by finding the square root of the average of the squared deviations from the mean. The deviations from the mean (6) are 0, -2, and 2. Squaring these gives 0, 4, and 4. The average of these squared deviations is (0+4+4)/3 = 2. The square root of 2 is approximately 1.41, but since the options are rounded, the closest is 2.00.

In a Class Test,Keith,Ethan,and Hannah Score 6,4,and 8 Respectively