Mathematics

Kendall Madden

19 January, 02:40

There are only red counters and blue counters in a bag.

Jim takes at random a counter from the bag.

The probability that the counter is red is 0.45

Jim puts the counter back in the bag.

Molly takes at random a counter from the bag.

She puts the counter back in the bag.

a) What is the p o ability that Jim and Molly take counters of different colours?

Give your answer as a decimal.

(2)

There are 81 red counters in the bag.

b) How many blue counters are there in the bag?

(2)

+

Total marks: 4