Answers edited by AbhilashGM
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You roll two balanced dice one time. What is the probability that you obtain either a sum of 8 or the same number on each of the two dice?

You have studied the number of people waiting in line at your bank on Friday afternoon at 3 pm for many years, and have created a probability distribution for 0, 1, 2, 3, or 4 people in line. The probabilities are 0.1, 0.3, 0.4, 0.1, and 0.1, respectively. What is the expected number of people (mean) waiting in line at 3 pm on Friday afternoon?