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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.

96. The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weights of all the boys in the class.
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97. A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is:
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98. If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is:
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99. The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% of a mean score of 31. The mean score of remaining 55% is
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