Question 188

The average of 7, 11, 15, x, 14, 21, 25 is 15, then the value of x is

Solution

we know that average =$$\frac {sum of elements}{numberof elements} $$

Number of elements =7

Sum of elements = 7+11+15+14+21+25+x = 93+x

=> Average = $$\frac {93+x}{7} $$

=> 15 = $$\frac {93+x}{7} $$

=> x = 12

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