TEST I. MEAN, VARIANCE AND STANDARD DEVIATION (80 points) Answer and do the following: 1. What is the mean of X? (10 points) 2. Find the variance and standard deviation of X. (20 points) Note: Create a table for the mean, variance and standard deviation. (10 points) 1. In a recent little league softball game, each player went to bat 4 times. The number of hits made by each player is described by the following probability distribution. Number of hits Probability X p(x) 0 10% 1 20% 2 30% 3 25% 4 15% 2. The number of adults living in homes on a randomly selected city block is described by the following probability distribution Number of adults Probability X p(x) 25% 50% AWN - 15% 10% TEST I. Rubrics for Problem Solving Descriptors Score All computation and graphs are complete and correct 10 Computation and graphs are generally correct but contain minor flaws 7 Computation and graphs are generally incorrect or incomplete Computation and graphs are incorrect No attempt