The following is a control chart for the average number of minor errors in 22 service reports. a. Determine the observed number of runs (median, and up/down), expected number of runs, standard deviation, and the ztest value for the median and up/down test. Use z=+l2 to compare your z test scores. (Negative amounts, if any, should be indicated by a minus sign. Round your answers to 2 decimal places.) Please use the table below to summarize your answer. b. Based on your calculations, conclude whether the test is random or non-random