For a group of four 60-year old men, the probability distribution for the number a who live through the next year is as given in the table below. P(x) 0 0.0005 1 0.0115 2 0.0975 W 0.3685 4 0.5220 Verify that the table is indeed a probability distribution. Then find the mean of the distribution. mean = Report answer accurate to 1 decimal place. Submit