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1)

 The mean deviation about  the mean for the following data is,

482021301_m1.PNG


A) 6.3

B) 1.5

C) 2.83

D) 1.733

Answer:

Option D

Explanation:

We have , the following data

482021390_m5.PNG

 Here , mean

(¯x)=xififi=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=523017.3310=1.733