Consider two datasets AAA (mean μ1=10,n1=10\mu_1 = 10, n_1 = 10μ1=10,n1=10) and BBB (mean μ2=20,n2=20\mu_2 = 20, n_2 = 20μ2=20,n2=20). What is the combined mean?
151515
16.6716.6716.67
17.517.517.5
13.3313.3313.33