During the past many summers, Ben and Jerry have had tourists stay at their bed and breakfast. On average, they receive 433 tourists. During the last summer of business, they received 470 tourists, which resulted in a z-score of 1.68. a. Determine the standard deviation, to the nearest whole number. (1 point) b. During the current summer of business, they received fewer tourists than the average. Explain how this would affect the z-score. (1 point)