2 When visiting the dentist the probability of waiting less than 5 minutes is 0.16 , and the probability of waiting less than 10 minutes is 0.88 .
- Find the probability of waiting between 5 and 10 minutes.
A random sample of 180 people who visit the dentist is chosen.
- Use a suitable approximation to find the probability that more than 115 of these people wait between 5 and 10 minutes.