6:11 Measurenents of the lengths in feet of 50 iron rods are distributed as follows : 3 Class boundary Frequency 2.35-2.45 2.45-2.55 4 2.55-2.65 7 2.65--2.75 15 2.75-2.85 11 2.85-2.95 10 2.95_-3.05 2 Find, to two decimal places, the value of the mean deviation. 6:11 Measurenents of the lengths in feet of 50 iron rods are distributed as follows : 3 Class boundary Frequency 2.35-2.45 2.45-2.55 4 2.55-2.65 7 2.65--2.75 15 2.75-2.85 11 2.85-2.95 10 2.95_-3.05 2 Find, to two decimal places, the value of the mean deviation