Use the probability distribution below to answer the following questions. X P(x) 0 0.128 1 0.206 2 0.216 3 0.178 4 0.213 5 0.059 a) Find the probability that x is 3 or more. b) Find the mean of the probability distribution. Round your answer to the nearest tenth. c) Given that the standard deviation of the probability distribution is 1.5, find the lower and upper boundaries that separate unusual values from those that are not unusual. Round values to the nearest tenth. Lower boundary: Upper boundary: d) Based on the values found in part (c), is a value of 5 considered unusual