Important Maths Formulas of Statistics and Probability
|Class Size||Class size = upper limit – lower limit|
|Range||Range = (Maximum value) – ( Minimum value)|
|Empirical Formula||Mode = 3 Median – 2 Mean|
|Mean of Ungrouped Data|
|Mean for n observations x1, x2, x3,...xn|
|Mean for a discrete series|
|Mean of Grouped Data|
|Assumed Mean Method|
|Step Deviation Method|
|Median of Ungrouped Data: To find the median of an individual series, arrange the given numbers in ascending or descending order.|
|Median, if the number of observations n is odd|
|Median, if the number of observations n is even|
|Median of Grouped Data|
|Mode of Ungrouped Data||It is the most frequently occurring observation|
|Mode of Grouped Data|
|Probability of an Event|
|· The Probability of a sure event is 1.
· The probability of an impossible event is 0.
· The sum of the probabilities of all the outcomes of an experiment is 1.
· For any event A associated to a random experiment, we have: