FACTS AND FORMULAE FOR AVERAGE QUESTIONS
1. Average =Sum of observationsNo. of observations
2. Suppose a man covers a certain distance x kmph and an equal distance at y kmph. Then, the average speed during the whole journey is2xyx+yKmph
The average weight of 25 bags is 55 kg. The weight of one bag was misread as 65 instead of 56. Find the correct mean value.
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The average height of A, B and C is 148 cm. If the average height of A and B is 136 cm and that of B and C is 125 cm, then what is the height (in cm) of B?
Find the value of '?, if the mean of the data set 18, 16, 22, 13, ? = 16.
Find the mean value of 2, 3, 3, 4, 6, 7
The median of the numbers 4, 2, 2, 6, 3 and 8 is
The mean of the data 1, 2, 10, 18, 3, 17, 19 is
The standard deviation of the set {10, 10, 10, 10, 10} is
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