There are n gallons of oil. after m gallons have been used then, in terms of m and n, what percent of oil remains? what percent was used?

The percent of oil remains is

The percent used was

Solution:

Given that, there are n gallons of oil.  

After m gallons have been used then, in terms of m and n

To find what percent was used:

To find what percent of oil remains:

solution:

as, mean is defined as sum of all the observations divided by total number of observations.

and , median is mid value of the data whether arranged in ascending order or descending order.

consider, roadsters:

2,3,4,5,6,7,8,9

mean =

also, median= , because number of observations is even, so median is mean of two mid values.

now, coming to bandits

2,3,4,5,6

mean =  

median = 4, as number of observations is odd.

so, roadsters has greater median as well mean than bandits.

→option a is true about the repairs performed on 2 types of cars:

bandits have lower median and mean than roadsters.