53, 75, 42, and 70 are marks obtained by 4 students is statistics. What is the arithmetic mean of their marks?

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answer is C.

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Detailed Solution

It is given that 4 students got 53, 75, 42, and 70 marks in statistics. We need to find the arithmetic mean of their marks.
The formula of mean is

= \frac{Sum of observations}{Number of observations}

.
On substituting the numbers in the formula, we get

= \frac{53 + 75 + 42 + 70}{4}

= \frac{240}{4}

= 60

Thus, the mean of the marks is 60.
Therefore, the correct option is 3.

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