Idon't understand this ; -;
sally can paint a room in 7 hours and john can paint the same room in 10 hours. how long should it take sally and john to paint the room together?

17 hours

Step-by-step explanation:

As we know altogether means how many in all or in an easier saying the total.The total is 17.Hope that help you!

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.