Let x<sub>i</sub>, i = 1, 2, ..., n be n observations and w<sub>i</sub> = px<sub>i</sub> + k, i = 1, 2, ..., n where p and k are constants. If the mean of x<sub>i</sub>'s is 48 and standard deviation is 12, whereas the mean of w<sub>i</sub>'s is 55 and standard deviation is 15, then the value of p and k should be
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