Solve the problem.
-A distribution of data has a maximum value of 81, a median value of 55.5, and a minimum of 30. Use the range rule of thumb to find the standard deviation. Round results to the nearest tenth.
A)10.2
B)25.5
C)6.8
D)12.8

Question

Quizplus · Accepted Answer

The range rule of thumb estimates the standard deviation (σ) as range/4. The range is the maximum value minus the minimum value, which is 81 - 30 = 51. Therefore, σ ≈ 51/4 = 12.75, rounded to the nearest tenth is 12.8.

Solve the Problem. -A Distribution of Data Has a Maximum Value of 81