5-2 Mean, Variance, Standard Deviation and Expectation Find the following probabilities: 1. Suppose two coins are tossed repeatedly, and the number of heads that occurred is recorded. What will be the mean of the number of heads? 2. Find the mean of the number of spots that appear when a die is tossed. 3. In a family with three children, find the mean of the number of children who will be girls. 4. A box contains 5 marbles. Two are numbered 3, one is numbered 4, and two are numbered 5. The marbles are mixed, and one is selected at random. After a ball is selected, its repeated many times, find the variance and standard deviation of the numbers on the marbles. 5. One thousand tickets are sold at $5 each for a iPad valued at $499. What is the expected value of the gain if you purchase one ticket