One quantitative variable recorded by the NHTSA is driver's severity of head injury (measured on a scale from 0 to 1,500). The mean and standard deviation for the 98 driver head-injury ratings are displayed in the Minitab printout below.

a. Give a practical interpretation of the mean.
b. Use the mean and standard deviation to make a statement about where most of the head-injury ratings fall.
c. Find the z-score for a driver head-injury rating of 408. Interpret the result.
For Information: Refer to Exercise 2.149.

Transcribed Image Text:

Descriptive Statistics: DRIVHEAD Variable N Hean StDev Hinimum1 Hedian ax imum DRIVHEAD 98 603.7 185.4 216.0 475.0 605.0 724.3 1240.0