The table shows the chemical formulas for four substances. Which substances have the same number of carbon atoms?

Substance 1 and 3.

Step-by-step explanation:

The subscripts indicate how many atoms there are for a certain molecule.

The first substance has two carbon atoms.

The third substance also has two carbon atoms.

If there is no subscript for the element, you can just assume it is one atom for a particular element.

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.