6 The residents of Mahjing were asked to classify their local bus service:
- \(25 \%\) of residents classified their service as good.
- \(60 \%\) of residents classified their service as satisfactory.
- \(15 \%\) of residents classified their service as poor.
- A random sample of 110 residents of Mahjing is chosen.
Use a suitable approximation to find the probability that fewer than 22 residents classified their bus service as good.
For a random sample of 10 residents of Mahjing, find the probability that fewer than 8 classified their bus service as good or satisfactory.Three residents of Mahjing are selected at random.
Find the probability that one resident classified the bus service as good, one as satisfactory and one as poor.