A college administration is interested in knowing how much money students spend on their textbooks. Suppose that they asked a sample of 5 students to tell them the cost of their most expensive textbook that semester, and they indicated the following: Pete: $145 Mario: $188 Amanda: $110 Cindy: $240 Jane: $160 A glance at these data suggests that there is substantial variation in the price of textbooks. Specify the extent of this variability by calculating the standard deviation.