What is the arithmetic mean of $25.2$ $25.2$ , $13.5$ $13.5$ , $18.5$ $18.5$ and $34.8$ $34.8$ ?

Question

(a) $13.5$ $13.5$
(b) $23$ $23$
(c) $18$ $18$
(d) $34.8$ $34.8$

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Answer 1 · 2016-08-22T17:36:47

$b) 23$ $b) 23$

Mean

$= \frac{25.2 + 13.5 + 18.5 + 34.8}{4}$ $=(25.2+13.5+18.5+34.8)/4$

$= \frac{92}{4}$ $=92/4$

$= 23$ $=23$

Answer 2 · 2016-08-22T17:40:54

The answer is (b) $23$ $23$ .

The arithmetic mean is sum of all the data points or numbers divided by their number.

Here we have four data points / numbers which are $25.2$ $25.2$ , $13.5$ $13.5$ , $18.5$ $18.5$ and $34.8$ $34.8$ .

Their sum is

$25.2 + 13.5 + 18.5 + 34.8 = 92.0$ $25.2+13.5+18.5+34.8=92.0$ and their arithmetic mean is $\frac{92.0}{4} = 23$ $92.0/4=23$ .

Hence, answer is (b) $23$ $23$ .