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