The Cincinnati Enquirer, in its Sunday business supplement, reported that the mean number of hours worked per week by those employed full time is 43.9. The article fur- ther indicated that about one-third of those employed full time work less than 40 hours per week. a. Given this information and assuming that number of hours worked follows the nor- mal distribution, what is the standard deviation of the number of hours worked? b. The article also indicated that 20% of those working full time work more than 49 hours per week. Determine the standard deviation with this information. Are the two esti- mates of the standard deviation similar? What would you conclude?