if the mean of 12, x, 5,7 and 13 is 9 find he value of x Share with your friends Share 1 Priyanka Kedia answered this Mean=Sum of all observationsTotal number of observation⇒9=12+x+5+7+135⇒9=37+x5⇒45=37+x⇒x=45-37⇒x=8 2 View Full Answer