Use the probability distribution below to answer the following questions. 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 significantly high values and significantly low values from those that are not significant. 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? Based on data from USA Today, 72% of adults have security concerns about online banking. Answer the following questions assuming 30 adults are randomly selected. a. Determine the probability exactly 20 of the adults have security concerns about online banking. places) b. Determine the probability that at least 20 of the adults have security concerns about online banking. decimal places) (Round to three decimal (Round to three