Question : If the arithmetic mean of 7,5,13, $x$ and 9 is 10, then the value of $x$ is:
Option 1: 10
Option 2: 12
Option 3: 14
Option 4: 16

Question

Question : If $(x + \frac{1}{x}) \neq 0$ and $(x^{3} + \frac{1}{x^{3}}) = 0$ , then the value $(x + \frac{1}{x})^{4}$ is:
Option 1: 9
Option 2: 12
Option 3: 15
Option 4: 16

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Answer 1

Correct Answer: 16

Solution : We know, Mean = $\frac{Sum of the numbers}{Total numbers in count}$
⇒ $10 = \frac{7 + 5 + 13 + x + 9}{5}$
⇒ $10 = \frac{34 + x}{5}$
⇒ $50 = 34 + x$
$∴ x = 16$
Hence, the correct answer is 16.

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Question : If the arithmetic mean of 7,5,13, x and 9 is 10, then the value of x is:Option 1: 10Option 2: 12Option 3: 14Option 4: 16

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Question : If the arithmetic mean of 7,5,13, $x$ and 9 is 10, then the value of $x$ is:
Option 1: 10
Option 2: 12
Option 3: 14
Option 4: 16