Question

The values of an observation are between 60 and 75. Then the average of the observations can be​

Answer 1

Answer:

Sixty seven and half will be the explanation

Answer 2

Answer:

The mean of total observations is 69.

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.