Statistics - NCERT Class 10 Maths
The chapter 14 begins with the concepts related to the measures of the central tendency i.e.: mean, median and mode for grouped data. The formula to determine the class mark, direct method to find the mean, assumed mean method and step-deviation method is discussed under the concept of ‘mean for grouped data’. Next, the formula to find the mode for grouped data is presented. Then the median of grouped data is introduced and cumulative frequency distribution of the less than type and more than type is discussed. The last section deals with the graphical representation of cumulative frequency distribution and the resulting curve is called the cumulative frequency curve, or an ogive.