brands uniformity

Question

Lives of two brands of private cars in a recent survey were found as

follows:

Life (No. of years) 0-4 4-8 8-12 12-16 16-20 20-24

Model A 5 9 11 7 6 2

Model B 2 7 13 8 4 6

(i) Which of the two brands shows more uniformity?

(ii) Suppose, Mr. Alam wants to buy a new car, which brand of car will he

prefer?

Answer 1

both have the same average lifespan, but A has lesser variance, smaller standard deviation, more uniformity

Mr. Alam would probably prefer Model B which has higher possible life span of 13 compared to A's 11

the lifespan may depend on the driver more than the model, which Mr. Alam can control through regular maintenance and more careful driving.

(sort of like Dom in Fast & Furious movies, saying it's not the car that matters, it's the driver)