There are fifty small balls in the tub. Few balls are white and some are orange. Without being able to see into tub, every student in the class of 25 is permitted to choose the ball out of tub at random. Color of ball is recorded and ball is put back into tub. At the end, seven orange balls and 18 white balls were picked. Find best estimate you can give for number of orange balls and number of white balls in tub? Explain how to compute best estimate and describe why method of calculation makes sense in a way that seventh-grader might understand. Is best estimate essentially accurate? Explain why or why not?