Pictured below (in scrambled order) are three histograms. One of them represents a population distribution. The other two are sampling distributions of x-bar: one for sample size n = 5 and one for sample size n = 30. Histogram 1: 400 300 Frequency 200 100 0 9 12 15 18 21 24 Histogram 2: 800 700 600 500 Frequency 400 300 200 107 3 6 9 12 15 18 21 24 Histogram 3: 350 300 250 200 Frequency 150 100 12 15 18 21 24 Based on the histograms, what is the most likely value of the population mean? O 7.5 O 4.5 O 3.0 O 0.5 350