If X and Y are two points on number line then the distance between them is represented by

Step-by-step explanation:

Let the point X be represented as (x1, y1) and the point Y be (x2, y2). The distance between the two points is expressed as;

D² = (x2-x1)² - (x2-y2)²

Take the square root of both sides;

√D² = √(x2-x1)² - (x2-y2)²

D = √(x2-x1)² - (x2-y2)²

Also the distance between X and Y can be represented as D = |X-Y|

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.

5   1/4   miles per hour

step-by-step explanation:

15   3/4 / 3 = 5   1/4