if the mean of x , x+3 x+7 , x+9, x+11. is 60. find the value of x . find the mean of last 2 observations
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1
(x+x+3+x+7+x+9+x+11)÷5=60
5x +30 =60
5x =60-30=30
x =6
5x +30 =60
5x =60-30=30
x =6
Answered by
5
mean = sum of all observation /no. of observation
mean =( x+9)+(x+11)/2
60=x. +9. +x.+ 11/2
60= 2x+9 + 11
60 = 2x+ 20
60-20 =2x
40=2x
40÷2 =x
x=20
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mean =( x+9)+(x+11)/2
60=x. +9. +x.+ 11/2
60= 2x+9 + 11
60 = 2x+ 20
60-20 =2x
40=2x
40÷2 =x
x=20
hope this helps you
mark it as a brainliest
Khan1231:
thanks akshi26
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