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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.

26. The average weight of 25 persons sitting in a boat had some value. A new person added to them whose weight was 46 kg only. Due to his arrival, the average weight of all the persons decreased by 5 kg. Find the average weight of first 25 persons?
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27. The average salary per head of the entire staff of an office including the officers and clerks is Rs.90. The average salary of officers is Rs.600 and that of the clerks is Rs.84. If the number of officers is 2, find the number of officers in the office?
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28. Three years ago the average age of a family of six members was 19 years. A boy have been born, the average age of the family is the same today. What is the age of the boy?
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29. The average of five results is 46 and that of the first four is 45. The fifth result is?
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30. The average of 11 results is 50, if the average of first six results is 49 and that of the last six is 52. Find the sixth result?
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Answer: Option B

Explanation:

1 to 11 = 11 * 50 = 550

1 to 6 = 6 * 49 = 294

6 to 11 = 6 * 52 = 312

6^{th} = 294 + 312 “ 550 = 56