PLEASE HELP ME I been stuck ON THIS 4 HOURS There are 324 students in Jefferson Middle School.
5/12 of the students are 7th graders. I need help please help me
1/4 of the students are 6th graders.
The rest are 8th graders.
How many students are 8th graders?

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.