Question

42. Mean of 7,9, 12, x, 4, 11 & 5 is 9.
Find the missing observation:​

Answer 1

Step-by-step explanation:

7+9+12+X+4+11+5

______________ = 9

7

48+X

_____ = 9

7

48+X = 9×7= 56

X= 72-56

X=16 is answer

Answer 2

Answer:

Given that ;

Mean of 7, 9, 12, x, 4, 11 & 5 is 9.

Sum of observations = 7 + 9 + 12 + x + 4 + 11 + 5

⇒ x + 48

No of observations = 7

We know that ;

Mean = Sum of observations

{Number of observations

Number of observations

Sum of observations

⇒ 9 ={x + 48}{7} 7x+48

⇒ 9 * 7 = x + 48

⇒ 63 = x + 48

⇒ x = 63 - 48

⇒ x = 15

Hence, the value of x is 15.

Step-by-step explanation:

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