The standard deviation for the numbers 8, 9, and 10 is
A) -3.0
B) 0.0
C) .67
D) 1.0

Question

Quizplus · Accepted Answer

The standard deviation measures the amount of variation or dispersion from the average. For the numbers 8, 9, and 10, the mean is 9. The differences from the mean are -1, 0, and 1, respectively. Squaring these differences gives 1, 0, and 1. The average of these squared differences is 2/3, and the square root of 2/3 is approximately 0.816, which rounds to 1.0, making option D correct.

The Standard Deviation for the Numbers 8, 9, and 10