CBSE NCERT Solutions for Chapter 14 Statistics Class 10 Maths
Statistics is the science of collection of data and We have studied the classification of given data into ungrouped as well as grouped frequency distributions. Further we have also learnt to represent the data pictorially in the form of various graphs such as bar graphs, histograms (including those of varying widths) and frequency polygons. In fact, you went a step further by studying certain numerical representatives of the ungrouped data, also called measures of central tendency, namely, mean, median and mode. In this chapter, we shall extend the study of these three measures, i.e., mean, median and mode from ungrouped data to that of grouped data. Three methods are discussed to find mean. The first one is the direct method, second one is assumed mean method and third is step deviation method. We shall also discuss the concept of cumulative frequency, the cumulative frequency distribution and how to draw cumulative frequency curves, called ogives.