11.30 course boasts that his course is so tough that the average golfer loses a dozen or more golf balls dur- ing a round of golf. A dubious golfer sets out to show that the pro is fibbing. He asks a random sam ple of 15 golfers who just completed their rounds to report the number of golf balls each lost. Assuming that the number of golf balls lost is normally distri uted with a standard deviation of 3, can we infer at The fol the 10% significance level that the average number ware. of golf balls lost is less than 12? for the 11.35 1 14 8 15 17 10 12 6 14 21 15 9 11 4 8