mike is an avid golfer who would like to improve his play. a friend suggests getting new clubs and let's mike try out his 7-iron. based on years of experience, mike has established that the mean distance of balls travel when hit with his old 7 iron is 175 yards with a standard deviation of 15 yards. he is hoping that this new club will make his shots with a 7 iron more consistent, so he does to the driving range and hits 50 shots with the new 7 iron. descrive the parameter of interest in this setting