Statistics Probability Mean Of Group Data Direct Method The three methods to find the mean of the grouped data is: direct method; assumed mean method; step deviation method. now, let us discuss all these three methods one by one. direct method. consider the same example as given above. now, convert the ungrouped data into grouped data by forming a class interval of width 15. Mean = a h × ∑if i(xi − a) h ∑if i a h × ∑ i f i (x i a) h ∑ i f i. this method is called "step deviation method". the calculation of mean by step deviation method is illustrated in the table. assumed mean a a is taken to be 92.5 92.5 and the step h h is taken to be 5 5. this simplifies the calculations.
Statistics Probability Mean Of Group Data Direct Method The following steps are required in order to calculate the arithmetic mean for grouped data: calculate the mid points of the class intervals in the given data set. the mid points or class marks, denoted by ‘m’ are computed by adding up the lower and upper class limits and dividing the said sum by 2. in other words, one needs to find the. There are two different formulas for calculating the mean for ungrouped data and the mean for grouped data. let us look at the formula to calculate the mean of grouped data. the formula is: x̄ = Σf i i n. where, x̄ = the mean value of the set of given data. f = frequency of the individual data. n = sum of frequencies. This video is about computing the mean from grouped data using the three methods. These exemplars problems and solutions cover the following topics in the chapter statistics and probability: determining the mean of grouped data by a direct method, assumed mean method and step deviation method; finding the mode of the given data; to find the median of the grouped data; representation of cumulative frequency distribution.
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