Katrina and amanda are studying the same class. on monday, katrina solved 35 math problems and amanda solved 21 math problems. on wednesday katrina solved 16 math problems and amanda solved 20 math problems. on thursday, katrina solved 40 math problems and amanda solved 24 math problems. on saturday, katrina solved 18 math problems and amanda solved 24 math problems. on which day did katrina and amanda have the same ratio of problems as monday?

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.

answer: a.   one is a factor of every whole number since every number is divisible by itself.