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Q.

What is the arithmetic mean of all the factors of 24?


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a

8.5

b

5.67

c

7

d

7.5  

answer is D.

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Detailed Solution

We need to find the arithmetic mean of all the factors of 24.
1, 2, 3, 4, 6, 8, 12, and 24 are the factors of 24.
The observations are 1, 2, 3, 4, 6, 8, 12, 24.
Number of observations is 8.
The formula of arithmetic mean is =Sum of observationsNumber of observations .
On substituting the values in the formula, we get
  =1+2+3+4+6+8+12+248   =608   =7.5 Thus, the arithmetic mean of factors of 24 is 7.5.
Therefore, the correct option is 4.
 
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