10th Class
Mathematics
Sample Paper
Mathematics Sample Paper-6
question_answer
If the mean of 6 observations\[\mathbf{x},\mathbf{x}+\mathbf{3},\mathbf{x}+\mathbf{6},\mathbf{x}+\mathbf{9},\mathbf{x}+\mathbf{12},\mathbf{x}+\mathbf{15}\] is 18, find the mean of first 4 observations.