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__Averages Formulae__

1. Average

Average = (Sum of observations/Number of observations)

2. Average Speed

Suppose a man covers a certain distance at X kmph and an equal distance at Y kmph.

Then, the average speed during the whole journey is {2xy/(x+y)} kmph.

Average = (Sum of observations/Number of observations)

2. Average Speed

Suppose a man covers a certain distance at X kmph and an equal distance at Y kmph.

Then, the average speed during the whole journey is {2xy/(x+y)} kmph.

1. The average of first 10 even numbers is?
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Answer: Option D

Explanation:

Sum of 10 even numbers = 10 * 11 = 110

Average = 110/10 = 11

2. The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.4 the sixth number is?
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Answer: Option D

Explanation:

1 to 11 = 11 * 10.9 = 119.9

1 to 6 = 6 * 10.5 = 63

6 to 11 = 6 * 11.4 = 68.4

63 + 68.4 = 131.4 â€“ 119.9 = 11.5

6^{th} number = 11.5

3. The average of first ten prime numbers which are odd is?
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Answer: Option D

Explanation:

Sum of first 10 prime no. which are odd = 158

Average = 158/10 = 15.8

4. The average of first 10 natural numbers is?
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Answer: Option B

Explanation:

Sum of 10 natural no. = 110/2 = 55

Average = 55/10 = 5.5

5. The average of first 10 odd numbers is?
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