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Let X_i, i = 1,2,.. , n be n observations and w_i = px_i +k, i = 1,2, ,n where p and k are constants. If the mean of x_i 's is 48 and the standard deviation is 12, whereas the mean of w_i 's is 55 and the standard deviation is 15, then the value of p and k should be | Watch the step-by-step video solution for this NIMCET PYQ.