Suppose that the amount of a weekly grocery bill of all households in a metropolitan area is distributed with a mean of $140. In a random sample of 49 households selected from this metropolitan area, the sample standard deviation is $35. (Use applet!) a. What statistic is used to analyze this situation? b. Find the statistic and probability that average amount of grocery bill of such a sample will be: i. more than $145, ii. less than $140, iii. between $132 and $148