Mis midpoint of ab. am = 11x - 9, and bm = 7x + 35.
1. find x
2. find am
3. find bm

if m is midpoint then AM=BM

11X-9=7x+35

4x=44

x=11

AM=11×11-9 =121-9=112

BM=112

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.