Probability › Drawing from bags › Colour ratios

Estimating red balls from draw frequencies

Middle school · ●○○○○ 10 pts

An opaque bag contains a total of

20

balls, each either red or white, identical except for color. A ball is drawn at random, its color is noted, and it is put back; this is repeated many times. The results are: - out of

50

draws,

11

red - out of

100

draws,

27

red - out of

200

draws,

50

red - out of

500

draws,

124

red - out of

800

draws,

201

red - out of

1000

draws,

249

red Estimate the number of red balls in the bag.

relative frequency experimental probability