Question

if the mean of observations is 6,7,x,8,y and 14 is 9 then x+y​

Answer 1

✞︎ Given :-

• The series are 6,7,x,8,y and 14
• Mean is 9

❦︎ To find :-

• The value of x + y ......

✯︎ Solution :-

We know that ,

❁︎ Mean = Sum of all observations /

No. of observations

➪︎ No. of observations = 6

☯️ Substituting in that,

➪︎ 9 = 6 + 7 + x + 8 + y + 14 / 6

➪︎ 9 × 6 = 35 + x + y

➪︎ 54 = 35 + x + y

➪︎ 54 - 35 = x + y

➪︎ x + y = 19

✰︎ Therefore x + y = 19....✔️