In a recent study on world happiness , participants were asked to evaluate their current lives on a scale from 0 to 10 , where represents the worst possible life and 10 represents the best possible life . The responses were normally distributed , with a mean of 4,7 and a standard deviation of 2.5 . Answer parts ( a ) ( d ) below (a) find the probability that a randomly selected study participants response is less than four is (b) find the probability that a randomly selected study participants response was between 4 & 6 is (c) find the probability that a randomly selected study participants response was more than 8 is (d) Identify any unusual events. Explain your reasoning. Choose the correct answer below A. The event in part (a) is unusual because its probability is less than 0.05 B. The events in parts (a) and (b) are unusual because their probabilities are less than 0.05 C. There are no unusual events because all the probabilities are greater than 0.05 D. The events in parts (a), (b) , and (c) are unusual because all of their probabilities are less than 0.05