Question

the mean of 20 observation is 8, if each observation is increased by 2, the mean of the new set is

Answer 1

Answer:

10 as the mean would also increase by 2.

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Answer 2

let each observer =x

then inc by 2=x+2

so the mean of twenty observer=8

=x+x+x+x+----++÷20=8

20x/20=8/1

20x=8(20)

=20x=160

x=8

now

inc by 2 case

x+2+x+2+x+2--++++--/20

=20x+40÷20=8+2

=so the answer would be x+4 =10

x=6

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