30. By
90 The mean of 12 Observations is
eror one
observation was noted cd 12 but was
mis read as al. what is the correct mean?
Answers
Answered by
0
Step-by-step explanation:
Correct option is C)
Mean of 20 observation =12.5
Sum of 20 observations =12.5×20
=250
Wrong observation is -15
Correct observation is 15
So, Sum of 20 observation correctly =250+15+15=280
First 15 is to eliminate the wrong observation and the other 15 for adding the correct observation in the data.
Correct mean =
20
280
=14
Similar questions