A jar contains only pennies, nickels, dimes, and quarters. There are 29 pennies, 13 dimes, and 12 quarters. The rest of the coins are nickels. There are 78 coins in all. How many of the coins are not nickels? If n represents the number of nickels in the jar, what equation could you use to find n?

answer: 91

step-by-step explanation:

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.