A bin is full of balls. 20% of them weigh 10 g and 80% of them weigh 11 grams. What is the average weight of a ball in the bin?

Answer 1

Compute the average weighted according to the percentages.

w = [(20%)(10 g) + (80%)(11 g)] / (100%) = [(20/100)(10) + (80/100)(11)] g = ? g