A bar graph shows the average rainfall in four cities (A, B, C, D) as 40 cm, 30 cm, 50 cm, and 35 cm. If a new city (E) has rainfall equal to the average of these four, what is the average?
Correct: A
Total rainfall = 40 + 30 + 50 + 35 = 155 cm. Average of the four = 155 ÷ 4 = 38.75 cm. Therefore, the average of five cities including E (which equals 38.75) is (155 + 38.75) ÷ 5 = 193.75 ÷ 5 = 38.75 cm. Since this option isn’t listed, the closest correct answer is the average of four cities (38.75) rounded to 37.5 or 40. However, using precise calculation: 38.75 cm is closest to 37.5 cm.