- Average:
Average = 
Sum of observations 
Number of observations - Average Speed:Suppose a man covers a certain distance at x kmph and an equal distance at y kmph.
Then, the average speed druing the whole journey is 2xy kmph. x + y
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Decimal Fractions: Fractions in which denominators are powers of 10 are known as decimal fractions . Thus, 1 = 1 tenth = .1; 1 = 1 ...
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Minute Spaces: The face or dial of watch is a circle whose circumference is divided into 60 equal parts, called minute spaces. Hour Hand and...
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Direct Proportion: Two quantities are said to be directly proportional, if on the increase (or decrease) of the one, the other increases (or...
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