Finding probabilities for normal distributions in exercise 7, find the indicated probabilities. If convenient, use technology to find the probabilities.

7.World Happines, in a recent study on world happines, participants were asked to evaluate their current lives on a scale from 0 to 10, where 0 represents the worst possible life and 10 represents the best possible life. The responses were normally distributed, with a mean of 5.4 and a standard deviation of 2.2. Find the probability that a randomly selected study participant's response was (a) less than 4, (b) between 4 and 6, and (c) more than 8. Identify any unusual events in parts (a)-(c). Explain the reasoning. (source: The Earth Institute, Columbia University)