Mathematics Class 10
Statistics
Group a list into classes, then find the mean, median and mode.
19 lessons · ~153 min total
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Lessons in this topic
- 0 Start here The road map: group a list into classes, find the mean, median and mode, then choose between them. · 4 min You are here
- 1 From a list to classes A long list folds into a few classes, and a two-column table keeps the counts. · 9 min
- 2 The class mark Each class is stood for by one number, the middle of its bounds, and the whole chapter computes with it. · 8 min
- 3 The direct mean Multiply each class mark by its frequency, add, and divide by the total frequency. · 9 min
- 4 The assumed mean Subtract a convenient number from every class mark, weight the small differences, and add it back. · 9 min
- 5 Step by step Divide every deviation by one common step h, work with small whole numbers, then undo the step. · 9 min
- 6 Checkpoint: tables, marks and three means Five quick checks on classes, the class mark and the three routes to the mean. · 6 min
- 7 Counting to the median Add frequencies down the table until the total reaches half of n, then use the formula inside that class. · 9 min
- 8 The modal class The tallest class is the modal class, and its two neighbours pull the mode off the class mark. · 9 min
- 9 Which average, when A few huge values pull the mean up far more than the median, and the question picks the average. · 9 min
- 10 Checkpoint: counting and choosing Five quick checks on the median, the mode and choosing an average. · 6 min
- 11 One table, three averages One table, three answers: the mean by three routes, the median by counting, and the mode by the formula. · 9 min
- 12 Find the missing frequency When the mean is given, one missing frequency comes from one equation. · 9 min
- 13 Two missing frequencies The total links x and y. The median finds x. Then y follows. · 10 min
- 14 Close the gaps between classes Classes such as 11-17 and 18-24 leave a gap. Close it before you find the median. · 8 min
- 15 From a "below" table to classes A "below" table holds running totals. Take away the total before to get each class. · 8 min
- 16 Checkpoint: missing numbers, gaps and running totals Five quick checks on missing frequencies, gaps and "below" tables. · 6 min
- 17 The big picture The whole chapter on one screen: classes, class mark, three means, median, mode and choosing. · 6 min
- 18 Track quiz A cheat-sheet table and fourteen quick questions on Chapter 13. · 10 min
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