A restaurant asks customers to rate their experience on a scale from 1 to 5 stars, with 1 star being least satisfied, and 5 stars being most satisfied. The table below represents the probability that a customer will give the indicated satisfaction rating. Satisfaction Rating, x 2 3 4 5 Probability, P(x) ? 0.05 0.12 0.19 0.45 Find the "?" value that would make this table a valid discrete probability distribution. If this is not possible, explain why