Problem 1.28 The following data record the reverse–bias collector current (in micro-amperes) for a set of twenty transistors. Reverse–bias collector current (in micro-amperes) for a set of n = 20 transistors 0.20 0.16 0.20 0.48 0.92 0.33 0.20 0.53 0.42 0.50 0.19 0.22 0.18 0.17 1.20 0.14 0.09 0.13 0.26 0.66 (Source: M. G. Natrella (1963), Experimental Statistics, National Bureau of Standards, vol. 91, U.S. Government Printing Office, Washington, D.C.)

(a) Compute the sample range and median of the lifetimes.

(b) Compute the lower and upper quartiles and the IQR. Are there any outliers?

(c) Draw the box plot.