mean of 20 observation is 17 in the observation, observations 40 is replaced by 12 find the new mean
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Answered by
34
Given :
Mean of 20 observations = 17
Mean = Sum of all observations / Total observations
17 = Sum of all observations / 20
Sum of all observations = 340
Now,
Incorrect observation = 40
Correct observation = 12
Difference = 40 - 12 = 38
Now,
New sum = 340 - 38 = 302
Now,
New mean = New sum / Total observations
New mean = 302 / 20
New mean = 15.1
^^"
Mean of 20 observations = 17
Mean = Sum of all observations / Total observations
17 = Sum of all observations / 20
Sum of all observations = 340
Now,
Incorrect observation = 40
Correct observation = 12
Difference = 40 - 12 = 38
Now,
New sum = 340 - 38 = 302
Now,
New mean = New sum / Total observations
New mean = 302 / 20
New mean = 15.1
^^"
Answered by
19
mean=sum observations/number of observation
17=x1+x2------+x19+40/20
20*17=x1+x2-----+x19+40
340=x1+x2-----+x19+40
340-40=x1+x2-------+x19
300=x1+x2-----+19
300+12=x1+x2-----+x19+12
312=x1+x2-----+x19+12
312/20=15.6
17=x1+x2------+x19+40/20
20*17=x1+x2-----+x19+40
340=x1+x2-----+x19+40
340-40=x1+x2-------+x19
300=x1+x2-----+19
300+12=x1+x2-----+x19+12
312=x1+x2-----+x19+12
312/20=15.6
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