Your company sells exercise clothing and equipment on the internet. to design the clothing, you collect data on the physical characteristics of your different types of customers. here are the weights (in kilograms for a sample of 12 male runners. assume that these runners can be viewed as a random sample of your potential male customers. suppose also that the standard deviation of the population is known to be ? = 3.5kg. 61.2 56.7 59.8 57.4 70 54.4 57.1 63.8 62 57.8 61.9 63.3 (a what is ? x, the standard deviation of x? 1.010 correct: your answer is correct. (b give a 95% confidence interval for ? , the mean of the population from which the sample is drawn. ( 62.429 incorrect: your answer is incorrect. , 58.470 incorrect: your answer is incorrect.