Mathematics
Statistics
सांख्यिकी
In Class 9 Mathematics, the chapter Statistics introduces ways to collect, represent, and interpret data clearly. Students learn to read and create bar graphs, stacked bar graphs, and 100% stacked bar graphs, then use measures such as mean, median, mode, weighted average, and range to compare data sets. The chapter develops practical skills for identifying patterns, drawing conclusions, and communicating numerical information accurately.
1Data representation
आँकड़ों का निरूपण
In this Class 9 Mathematics topic from the Statistics chapter, students learn how to organise and present collected data in a clear, meaningful form. They explore frequency tables and visual representations such as bar graphs, histograms, and frequency polygons, while recognising how each display communicates information. The topic also develops skills in reading scales, comparing values, identifying patterns, and drawing sensible conclusions from data.
0 questionsBar graphs
दंड आलेख (बार ग्राफ)
In Class 9 Mathematics, this Statistics topic introduces students to bar graphs as a clear way to represent and compare categorical or discrete data. Students learn to read titles, axes, labels, scales, and frequencies; distinguish separate bars from continuous graphs; draw accurate graphs from tables; and interpret patterns, differences, and highest or lowest values. Practice focuses on choosing a suitable scale, plotting bars with correct widths and gaps, and answering data-based questions.
0 questionsStacked bar graphs
संचित दंड आलेख
In Class 9 Mathematics, under Statistics, students learn how stacked bar graphs represent several related categories within one bar. They practise reading the scale and legend, identifying individual segments and overall totals, comparing groups, and interpreting patterns in data. The topic also develops skills in organising categorical information, constructing a clear stacked bar graph from a data table, and drawing conclusions while distinguishing between part-to-whole relationships and direct comparisons.
0 questions100% stacked bar graphs
100% स्तरीकृत बार ग्राफ
In this Class 9 Mathematics topic from Statistics, students learn how to represent each whole as a bar of equal height or length, divided into segments that together make 100%. They convert data or frequencies into percentages, choose suitable scales, label categories and legends, and read values from a 100% stacked bar graph. The topic develops skills for comparing the composition of different groups, identifying similarities and differences, and interpreting how each category contributes to the whole.
0 questionsMean
माध्य
In Class 9 Mathematics, the topic Mean in the Statistics chapter explains how to find a single value that represents a set of data. Students learn to calculate the arithmetic mean by adding all observations and dividing the total by the number of observations. They also practise interpreting the result, comparing data sets, and understanding how each value contributes to the overall average in everyday and mathematical situations.
0 questionsMedian
माध्यिका
In Class 9 Mathematics, the topic Median introduces an important measure of central tendency in the Statistics chapter. Students learn to arrange observations in ascending or descending order, identify the middle value for an odd number of observations, and find the average of the two middle values when the number of observations is even. They also practise calculating the median from simple data sets and interpreting it as a representative value that is less affected by unusually high or low observations.
0 questionsMode
बहुलक
In Class 9 Mathematics, the topic Mode introduces students to the value that occurs most frequently in a data set. As part of Statistics, it helps learners identify the most common observation, read frequency tables, and understand how repeated values describe a group of data. Students practise finding the mode from simple lists and organised data, distinguish it from mean and median, and interpret when it is useful for summarising real-life information such as survey responses or everyday measurements.
1 questionsWeighted average
भारित औसत
In this Class 9 Mathematics topic from the Statistics chapter, students learn how to find an average when different values have different levels of importance, or weights. They understand the meaning of a weighted average, multiply each observation by its assigned weight, add the products, and divide by the total weight. The topic also helps students interpret results and apply the method to practical examples such as marks, prices, quantities, and survey data.
0 questionsInterpretation of data
आँकड़ों की व्याख्या
In Class 9 Mathematics, this topic from Statistics helps students interpret information presented in tables, bar graphs, histograms, and other common data displays. They learn to identify what the data shows, compare categories, notice patterns and changes, and draw conclusions supported by the values rather than by guesswork. The topic also builds careful reading of frequency distributions and connects visual representations with measures such as mean, median, and mode, enabling students to explain statistical findings clearly in everyday and academic contexts.
0 questionsRange (Measure of Dispersion)
परास (प्रसरण का माप)
In Class 9 Mathematics, Range is introduced in the Statistics chapter as a simple measure of dispersion. Students learn to find the range of a data set by subtracting the smallest observation from the largest observation. The topic helps them understand how widely data values are spread and compare the variability of different sets. Examples and practice with ordered and unordered data strengthen accuracy in identifying maximum and minimum values and interpreting results.
1 questions