Question

the mean of 40 observations is 75 and mean of another 60 observation is 65. Then mean of total observation is

Answer 1

Answer:

Step-by-step explanation:

total observations by first is

40 * 75 = 3000

by the second is

60 * 65 = 3900

Now total mean of observations or collectively are

(3000 + 3900) / 100

= 69

Answer 2

HEY Buddy.....!! here is ur answer

Given that : the mean of 40 observation is 75 then it's total = 40×75 = 3000

after that the mean of second 60 observation is 65 then it's total = 60×65 = 3900

Then, number of observation after added = 40+60 = 100

and Total of 100 observation = 3000+3900 = 6900

Now, mean of 100 observations = 6900/100

=> Mean = 69

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