find the mean of observation x, x + 3 X + 5 x + 7 and X + 10 is 9 what is last third observation
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given that mean is 9
sum of all observation /no of observation =mean
x+x+3+x+5+x+7+x+10 /5=9
5x+25/5 =9
5x+25=9×5
5x+25=45
5x=45-25
5x=20
x=20/5
x=4
third observation
1.4
2.7
3.9
4.11
5.14
sum of all observation /no of observation =mean
x+x+3+x+5+x+7+x+10 /5=9
5x+25/5 =9
5x+25=9×5
5x+25=45
5x=45-25
5x=20
x=20/5
x=4
third observation
1.4
2.7
3.9
4.11
5.14
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