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The process of preparing this type of distribution is

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Unformatted text preview: ring this type of distribution is very simple. We have just to count the number of times a particular value is repeated, which is called the frequency of that class. In order to facilitate counting prepare a column of tallies. In another column, place all possible values of variable from the lowest to the highest. Then put a bar (Vertical line) opposite the particular value to which it relates. To facilitate counting, blocks of five bars are prepared and some space is left in between each block. We finally count the number of bars and get frequency. Example 1: In a survey of 40 families in a village, the number of children per family was recorded and the following data obtained. 1 0 3 2 1 5 6 2 2 1 0 3 4 2 1 6 3 2 1 5 3 3 2 4 2 2 3 0 2 1 4 5 3 3 4 4 1 2 4 5 Represent the data in the form of a discrete frequency distribution. 50 Solution: Frequency distribution of the number of children Number of Children 0 Tally Marks Frequency 3 1 2 3 7 10 8 4 5 6 6 4 2 40 Total b) Continuous frequency distribution: In this form of distribution refers to groups of values. This becomes necessary in the case of some variables which can take any fractional value and in which case an exact measurement is not possible. Hence a discrete variable can be presented in the form of a continuous frequency distribution. Wage distribution of 100 employees Weekly wages (Rs) 50-100 100-150 150-200 200-250 250-300 300-350 350-400 Total Number of employees 4 12 22 33 16 8 5 100 51 4.3 Nature of class: The following are some basic technical terms when a continuous frequency distribution is formed or data are classified according to class intervals. a) Class limits: The class limits are the lowest and the highest values that can be included in the class. For example, take the class 30-40. The lowest value of the class is 30 and highest class is 40. The two boundaries of class are known as the lower limits and the upper limit of the class. The lower limit of a class is the value below which there can be no item in the class. The upper limit of a class is th...
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