Question

In a study on public parking, the director of transportation counted the number of cars in each of city's parking lots. Number of cars Number of parking lots 102 4 112 2 118 1 166 3 X is the number of cars that a randomly chosen parking lot had. What is the expected value of X? Write your answer as a decimal.

Answer 1

x y x*f

102 4 408

112 2 224

118 1 118

166 3 498

sum 1248

total number of frequencies = 4 + 2 + 1 + 3 = 10

Expected value = 1248/10 = 124.8

Result = 124.8