1) The mean deviation about the mean for the following data is, A) 6.3 B) 1.5 C) 2.83 D) 1.733 Answer: Option DExplanation:We have , the following data Here , mean (¯x)=∑xifi∑fi=4+16+50+56+542+4+10+8+6=18030=6 ∴ Mean deviation about mean =∑fi|xi−¯x|∑fi =2.(4)+4.(2)+10.(1)+8.(1)+6.(3)30 = 8+8+10+8+1830=5230≈ 17.3310=1.733