I just need help understanding how to solve this

rmal Exam Keview Example Question 6: probability models Suppose that x represents the number of cars sold at a dealership in a randomly selected single day. The probability distribution of x is given in the table below. 6 7 8 9 10 p(x) 0.04 0.09 0.17 0.29 0.20 0.14 0.07 (a) Find the population mean u. E(X) = Ux = x * p(x) all x (b) Calculate the population variance o2 62 = E(X2) - 12 -> x2p( x ) - 12 all x (c) Suppose 20 observations are taken independently from this distribution and the sample mean X of these observations is recorded. What would be the mean and standard deviation for the sampling distribution of X? 17