A bag contains 5 yellow marbles and 10 blue marbles. If a representative sample contains 2 yellow marbles, then how many blue marbles would you expect it to contain? Explain. Because the ratio of yellow marbles to blue marbles is blank in the population, the expected number of blue marbles is blank times the number of yellow marbles in the representative sample. There should be blank blue marbles.

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.

Line wx is parallel to line yz. if m

How many degrees are there in the central angles in a circle