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# Let $\;\overline{x}\;$ M.D. be the mean and the mean deviation about $\;\overline{x}\;$ on n observations $\;x_{i} , i=1,2,...,n\;$.If each of the observations is increased by 5 , then the new mean and the mean deviation about the new mean , respectively , are :

$(a)\;\overline{x}\;, \normalsize M.D.\qquad(b)\;\overline{x}+5\;, M.D.\qquad(c)\;\overline{x}\;, M.D.+5\qquad(d)\;\overline{x}+5\;, M.D.+5$