3.10. An article in Quality Engineering (Mol. 4, 1992, pp. 487-495) presents viscosity data from a batch chemical process. A sample of these data is presented in Table 3E.3 (read down, then across). (a) Construct a stem-and-leaf display for the viscos- 3. ity data. (b) Construct a frequency distribution and histogram. (c) Convert the stem-and-leaf plot in part (a) into an ordered stem-and-leaf plot. Use this graph to assist in locating the median and the upper and lower quartiles of the viscosity data. (d) What are the tenth and ninetieth percentiles of viscosity? 3.11. Construct and interpret a normal probability plot of the volumes of the liquid detergent bottles in Exercise 3.1. 3.12. Construct and interpret a normal probability plot of the nine furnace temperature measurements in Exercise 3.5 3.13. Construct a normal probability plot of the failure time data in Exercise 3.8. Does the assumption that failure time for this component is well modeled by a normal distribution seem reasonable?