The table shows the number of coins in a change dish. If Malcolm selects two coins at random without replacement, what is the probability that he selects a nickel followed by a dime?

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.

pi or 3.14159265359 is an irratinal decimal

well, because the $0.25 is an added cost depending on how many minutes, the answer would be y = 30 + 0.25x.