the mean of 40 observations is 75 and mean of another 60 observation is 65. Then mean of total observation is
Answers
Answer:
The mean of total observations is 69.
Step-by-step explanation:
Given, mean of 40 observations is 75 .
So,
= > Mean of 40 observations = ( sum of 40 observations ) / 40
= > 75 = ( sum of 40 observations ) / 40
= > 75 x 40 = sum of 40 observations
= > 3000 = sum of 40 observations
Now, it is also given that the mean of other 60 observations is 65.
So,
= > Mean of 60 observations = ( sum of 60 observations ) / 60
= > 65 = ( sum of 60 observations ) / 60
= > 65 x 60 = sum of 60 observations
= > 3900 = sum of 60 observations
Now,
Total number of observations = 40 + 60
Total number of observations = 100
Sum of all the observations = ( 3000 + 3900 )
Sum of the observations = 6900
Then,
Means = ( 6900 ) / 100
Means = 69
Therefore the mean of total observations is 69.
Answer:
Mean of total observation = 69
Step-by-step explanation:
Given, Mean of 40 observations = 75.
We know that mean = (Sum of observations/Number of observations)
75 = (Sum of observations)/40
Hence, Sum of observations = 75 * 40
= 3000.
Similarly sum of observations of other data = 60 * 65
= 3900
Total, Sum of observations of both the data = 3900 + 3000
= 6900
Total number of observations = 40 + 60
= 100
Therefore, New mean = 6900/100
= 69.
Hope this helps!