Question : What is the average of the first six (positive) odd numbers each of which is divisible by 7?
Option 1: 42
Option 2: 43
Option 3: 47
Option 4: 49
Correct Answer: 42
Solution :
The first six positive odd numbers that are divisible by 7 are 7, 21, 35, 49, 63 and 77.
So, the average of these six numbers is:
$\text{Average}=\frac{\text{Sum of all the observations}}{{\text{Total number of observations}}}=\frac{7 + 21 + 35 + 49 + 63 + 77}{6} = \frac{252}{6} = 42$
Hence, the correct answer is 42.
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