A survey of 10 families asked the number of times that a takeout meal had been ordered during the previous two weeks. The following data were obtained. 0, 7, 7, 4, 2, 11, 3, 1, 11, 4 (a) Find the sample mean. x = (b) Estimate with 90% confidence the mean number of takeout meals ordered during the previous two weeks by families, assuming that the population is normally distributed with a standard deviation of 3. Confidence Interval =