Question

Need help to clear these 2 sums related to mean. correct answers are needed.

Answer 1

hey mate

here is your answer

Answer 2

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21.)

It is given that

Mean of 31 results = 60

So the total sum = 31 (60) = 1860

We know that

Mean of first 16 results = 58

So the total sum = 16 (58) = 928

Mean of last 16 results = 62 So the total sum = 16 (62) = 992

We get the 16th result total sum of first 16 results + total sum of last 16 results - total sum of 31 results

By substituting the values

16th result = 928 +992 - 1860

On further calculation

16th result = 1920 - 1860 = 60

Therefore, the 16th result is 60.

22.)

It is given that

Mean of 11 numbers = 42

So the total sum 42 (11) = 462

Mean of first 6 numbers = 37

So the total sum = 37 (6) = 222

Mean of last 6 numbers = 46

So the total sum = 6 (46) = 276

We know that

6th number = total sum of last 6 numbers + total sum of first 6 numbers - total sum of 11 numbers

By substituting the values

6th number = 276 + 222 - 462

So we get

6th number = 498 – 462 = 36

Therefore, the 6th number is 36.

HOPE THIS ACTS HELPFULLY.......!!!

THANK YOU :)