Question

the mean of 11 observations is 30 the mean of first 6 observations is 28 and the last 6 observations is 32 the 6th observation is​

Answer 1

Answer:

Let the 6

th

number be X

Given that mean of 11 results =30

∴ sum of 11 numbers =11×30=330

Mean of the first 6 results =28

Sum of the first 6 numbers 6×28=168

Mean of the last 6 results =32

Sum of thelast 6 numbers 6×32=192

Therefore, Sum of first 6 numbers + sum of last 6 number - 6

th

number = sum of 11 numbers

168+192−X=330

⇒ 360−X=330

⇒ X=30

Step-by-step explanation:

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