A local Mexican restaurant, Fiesta Cafe, tracks how many tacos each customer buys and records the following probabilities: The probability that a customer buys 0 tacos is 0.155. The probability that a customer buys 1 taco is 0.223 . The probability that a customer buys 2 tacos is 0.311 . The probability that a customer buys 3 tacos is 0.311 . What is the expected value of the number of tacos purchased by each customer? Do not specify units, just the value