Answer to Question #25721 in Statistics and Probability for Jen
m = (m1*N1+m2*N2)/(N1+N2)
m1 - the mean for the experimental group
m2 - was the mean for the students in the regular program
N1 - number of students in an experimental program
N2 - number of students in a regular program
m2 = (m(N1+N2) - m1*N1)/N2 = (79*1000 - 83*200)/(1000-200) = 78
Answer:& the mean for the students in the regular program was 78.
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