if the mean of observation x, x + 3 X + 5 x + 9 X + 10 is 9 find the value of x
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x+x+3+x+5+x+7+x+10/ 5=9
5x+25=45
5x=45-25
5x=20
x=4
mean of last three observations = x+10+x+7+x+5/3
= 4+10+4+7+4+5/3
=12+22/3=34/3=11.33 approx
5x+25=45
5x=45-25
5x=20
x=4
mean of last three observations = x+10+x+7+x+5/3
= 4+10+4+7+4+5/3
=12+22/3=34/3=11.33 approx
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