Answer:

Step-by-step explanation:
We can see from the graph that
can't be lesser than
and
extends unendlessly in the positive direction.
80%=.8, .8*685=548. This is the simple math that you need. For the percentages, move the decimal place two places to the left and then multiply by the number that you want to get the percentage of.
Step-by-step explanation:
By Completing the Square,

Since the first tern is at most zero, the maximum value occurs when

I HAVE THE FOLLOWING APPROACH
WE KNOW THAT THE MEAN IS 17,
WE ADD ALL THE NUMBERS AND GET 142+A+B= 17*10
142+A+B=170
A+B=28
NOW MEDIAN IS 18,
WE HAVE 10 NUMBERS, THAT MEANS THE MEDIAN WILL BE (17+B)/2=18
B=19
A=9
THESE ARE YOUR NUMBERS