3.23. Consider the chemical process yield data in Exercise 3.9. Calculate the sample average and stan- dard deviation. 3.24. Consider the chemical process yield data in Exercise 3.9. Construct a stem-and-leaf plot for the data and compare it with the histogram from Exercise 3.9. Which display provides more infor- mation about the process? 3.25. Construct a box plot for the data in Exercise 3.1. 3.26. Construct a box plot for the data in Exercise 3.2. 3.27. Suppose that two fair dice are tossed and the 3. random variable observed say, x is the sum of the two up faces. Describe the sample space of this experiment, and determine the probability distribution of x. 3.28. Find the mean and variance of the random variable in Exercise 3.27.