... VARIABLES20 40 60 80 100 120 140 00.010.020.030. 04 0.050.060.070.0820 40 60 80 100 120 140 00.010.020.030. 04 0.050.060.070.0820 40 60 80 100 120 140 00.010.020.030. 04 0.050.060.070.08n ... series lengths: four-game, five-game, six-game, seven-game.(b) Using one of the distribution found in part (a), find the probability thathis batting average exceeds .40 0 in a four-game series. (The ... variance 1, then (cf. Exam-ple 7.5)fXi(x)=1√2πe−x2/2, 4 J. B. Uspensky, Introduction to Mathematical Probability (New York: McGraw-Hill, 1937),p. 277. 290 CHAPTER 7. SUMS OF RANDOM...