6 In Questa, 60\% of the adults travel to work by car.
- A random sample of 12 adults from Questa is taken.
Find the probability that the number who travel to work by car is less than 10 .
- A random sample of 150 adults from Questa is taken.
Use an approximation to find the probability that the number who travel to work by car is less than 81 .
- Justify the use of your approximation in part (b).