7. Find the variance and standard deviation of the following probability distribution. Show a completed table. Round values to the third decimal place [3] P(x) 0 05 2 0.20 4 0.65 6 0.10 o' = var(x) = o = s.d.(x) = 8. The table below shows the breakdown of tax returns that were audited during a given year. Selected for Audit Income Level Yes No Total Low (L) 90 14010 14100 Medium (M) 71 31629 31700 High (H) 69 24631 24700 Upper (U) 80 10620 10700 Total 310 80890 81200 If a tax return from the population was randomly selected, find the following probabilities. [4] (NOTE: Give your answer only as decimal to four places, no work needs to be shown here.) a. P(L) = b. P(No) = c. P( M or H) = d. P(U and Yes) = e. P(Yes [ L) = f. P(H and No) = g. P(Yes | U) = h. P(U | Yes) =