Answer
a) 430.1 hic is the mean
b) 393.0 hic is the median
c) There is not a mode
d) 435.0 hic is the midrange
The Hyundai Elantra is the safest car.
No small cars do not appear to have about the same risk of head injury.
Work Step by Step
a) To find the mean add up all the numbers and divide it by the number of values there are.
$\frac{371+356 +393 +544 +326 +520 +501}{7}$= 430.1
b) The middle value is 393
c) No numbers are repeated more than once. Therefore there is no mode.
d) To find mid range add the maximum and minimum values and divide it by 2.
$\frac{544+326}{2}= 435
This is the safest car because based on the data it is the car with the least amount of head injuries during a crash.
Also because there is such a wide of the number of head injuries, you can tell that some cars are safer than others which means they don't have the same risk of head injury.