Question

find x, if hear of 5, 7, 9, and x is 9​

Answer 1

Step-by-step explanation:

Observations :-

5,7,9,x

Sum of Observations:-

$5 + 7 + 9 + x \\ = 21 + x$

No of observations:-

$4$

Mean value = Sum of Observations/No of Observation

$9 = (21 + x) \div 4$

$= > 21 + x = 9 \times 4$

$= > 21 + x = 36$

$= > x = 36 - 21$

$= > x = 15$

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