Question 19 {Mandatory} (1 point} A hamburger stand reports that its sales consist of 25% single, 30% double, 20% triple, and 25% vegetarian burgers. The company report includes the circle graph shown. Why does the manager believe that the graph is not correct? Hamburger Sales II 1! IS ID IT IV Question 20 (Mandatory) (1 point) July 1 high temperatures, in degrees Celsius, for an Ontario city, over a 12-year period are listed. 31 28 26 30 30 22 27 18 29 37 28 35 a) Calculate the median, range, Q1, Q3, and interquartile range. b) Determine whether there are any outliers. A/Question 21 {Mandatory} [1 point} A particular brand of batteries has a mean lifetime of 58.4 months, with a standard deviation of 5.2 months. A sample of 12 batteries was taken and their lifetimes, in months, are recorded. 56.3 59.2 61.8 43.1 68.8 51.2 58.5 56.4 64.2 66.9 49.0 60.1 a] Calculate the mean, variance, and standard deviation. b} Compare the average lifetime and spread of the sample to those of the population. c} What are the zscores of the extreme upper and lovver lifetimes