The average age of Stokes County school board members over the last 40 years has been 46, but members have ranged from 29 to 67. Use the range rule of thumb to estimate the
Standard deviation of the members' ages.
A) 9.5
B) 24
C) 47.3
D) 19

Question

Quizplus · Accepted Answer

The range rule of thumb estimates the standard deviation as the range divided by 4. The range is 67 - 29 = 38. Dividing 38 by 4 gives 9.5.

The Average Age of Stokes County School Board Members Over