Question

It's holds same size discs there are five red six White and seven blue you pick a disk record the colour then put it back in if you do this 250 more times how many times can you expect to pick either a red or white disk?

Answer 1

Total number of disks . . . . . 18

Number of red disks = 5
Number of white disks = 6

Number of (red or white) disks = (5 + 6) = 11

Probability of selecting a (red or white) disk = 11/18 .

Number of expected successes in 251 draws = (11/18) x (251) = 153 .