Answer:
C. 6
Step-by-step explanation:
The range of a data set is the smallest number subtracted from the biggest number. In this case 7 is the biggest number, and 1 is the smallest number. This gives us the equation 7 - 1 = <em>range</em> which gives us 6.
By addition of the ratio, 5/8 people are adults
144 * 5/8 = 90