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(1).mean=sum of observations/no.of observations
mean=2+4+18+12+4+40/6
mean=80/6
mean=13.3333333333333 ANS.
(2)AB^2=AC^2+BC^2
7^2=25^2+BC^2
BC^2=25^2-7^2
BC^2=625-49
BC^2=576
BC=√576
BC=24 ANS.