Can someone me i know the first answer for her room is 9ft wide , but i don't know the second part!

When only separate discreet points are graphed it is called?

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

Use the frequency distribution, which shows the number of american voters (in millions) according to age, to find the probability that a voter chosen at random is in the 18 to 20 years old age range. ages frequency 18 to 20 5.9 21 to 24 7.7 25 to 34 20.4 35 to 44 25.1 45 to 64 54.4 65 and over 27.7 the probability that a voter chosen at random is in the 18 to 20 years old age range is nothing. (round to three decimal places as needed.)