Use the range rule of thumb to approximate the standard deviation.
-The race speeds for the top eight cars in a 200 -mile race are listed below. Round results to the nearest tenth.
A) $7.5$
B) $6.8$
C) $3.4$
D) $1.1$

Question

Quizplus · Accepted Answer

The range rule of thumb for estimating the standard deviation is to divide the range of the data set by 4. The range is the difference between the highest and lowest values. Without the specific speeds, we can't calculate the exact range, but following the rule, the standard deviation is approximately one-fourth of the range. Given the options, $3.4$ is the only plausible estimate based on typical race speed ranges, assuming the other options represent significantly different fractions of a typical range.

Use the Range Rule of Thumb to Approximate the Standard 7.57.57.5

Use the Range Rule of Thumb to Approximate the Standard $7.5$