Question

You need to purchase a battery for your car. There are two types available. Type A has a mean life of five years and a standard deviation of one year. Type B has a mean life of five years and a standard deviation of one month. Both batteries cost the same. Which one should you purchase if you are concerned that your car will always start?

Answer 1

Type B

Explanation:

For my car to always start i will go for Type B because it has a lesser standard deviation and statistically the lesser the standard deviation the closer it is to the mean, therefore with a mean of 5 years, a lesser standard deviation of one month gives me a higher chance that my car will start always than that of one year.