The ratio of the number of boys to the number of girls in a class is 4 ∶ 15. The average height of the boys is 161.2 cm and the average height of all the students is 154.5 cm. What is the average height (in cm) of the girls? (Correct to one decimal place)
1
156.8
2
147.5
3
152.7
4
158.2