It's super easy and simple, just plz show your work thank you

1. Let X, = 2, X2 = 7, X3 = 5, X, = 6. Use the rules of summation to find: a. EX' b. (EX)] = a. [note that answers to a and b should be different, based on whether you "square" before vs. after summing] 2. The following are scores of 8 students who participated in a psychology experiment (2, 6, 3, 1, 4, 2, 2, 4). The scores represent the number of trials required to complete a memorization test. (Consider the students to be a sample). You may use a calculator, R, or EXCEL to help you, but show all your work along the process (don't just use an R function to calculate it for you). Calculate: a. Mean = 3 b. Median = 2.5 c. Mode = 2 d. Range = 5 e. Variance = f. Standard Deviation =