Question : If the mean of five numbers 1, 2, 3, 5, and $x$ is 2.4, then find the value of $x$.
Option 1: 2
Option 2: 4
Option 3: 1
Option 4: 3
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Correct Answer: 1
Solution : Given: The mean of five numbers 1, 2, 3, 5, and $x$ is 2.4. Use the formula, $\text{Mean}=\frac{\text{Sum of all the terms}}{\text{The total terms}}$ According to the question, ⇒ $2.4=\frac{1+2+3+5+x}{5}$ ⇒ $2.4\times 5=11+x$ ⇒ $12=11+x$ $\therefore x=1$ Hence, the correct answer is 1.
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