If the mean deviation about the median of the numbers a,2a,3a........,50a is 50. Then "modulus of a" equals ?? plz answer fast.. Share with your friends Share 0 Utsav answered this Numbers are a,2a,3a.............50a Hence the numbers are arranged in ascending orderNow total numbers = 50 Hence value of n is odd∴median = 25a+26a2=25.5 aDeviation of the number about the median is a-25.5a,2a-25.5a........50a-25.5aMean deviation about the median =∑i=150xi-M50∴ a-25.5a+2a-25.5a+........50a-25.5a50=50⇒24.5a+23.5a+22.5a+.........0.5a+0.5a+...............23.5a+24.5a =2500⇒2(0.5a+1.5a+..........24.5a) =2500⇒2×2520.5a+24.5a =2500 (as sum of an A.P is n2(1st term+last term))⇒25 ×25 a=2500⇒a =2500625=4 13 View Full Answer