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### Theory

 1 Introduction to statistics 2 Arithmetic mean 3 Measures of dispersion 4 Deviations from mean, Variance and Standard deviation 5 Methods to calculate the standard deviation of ungrouped data 6 Methods to calculate the standard deviation of grouped data 7 Direct method to find standard deviation of ungrouped data - Example 8 Mean method to find standard deviation of ungrouped data - Example 9 Assumed mean method to find standard deviation of ungrouped data - Example 10 Step deviation method to find standard deviation of ungrouped data - Example 11 Mean method to find standard deviation of grouped data - Example 12 Assumed mean method to find standard deviation of grouped data - Example 13 Step deviation method to find standard deviation of grouped data - Example

### Textbook Questions

 1 Multiple choice questions - I Difficulty: easy 4 2 Multiple choice questions - II Difficulty: easy 3 3 Two mark example problems Difficulty: medium 6 4 Two mark exercise problems - I Difficulty: medium 8 5 Two mark exercise problems - II Difficulty: medium 6 6 Five mark example problems - I Difficulty: hard 15 7 Five mark example problems - II Difficulty: hard 15 8 Five mark example problems - III Difficulty: hard 15 9 Five mark example problems - IV Difficulty: hard 10 10 Five mark exercise problems - I Difficulty: hard 15 11 Five mark exercise problems - II Difficulty: hard 10

### Practice Questions

 1 Find the largest value Difficulty: easy 2 2 Find the range of the distribution Difficulty: easy 2 3 Find the standard deviation Difficulty: easy 2 4 Find the variance Difficulty: easy 2 5 Find the range and its coefficient Difficulty: medium 2 6 Calculate the standard deviation by direct method Difficulty: medium 5 7 Calculate the standard deviation by mean method Difficulty: medium 5 8 Calculate the standard deviation by assumed mean method Difficulty: medium 5 9 Calculate the standard deviation by step deviation method Difficulty: medium 5 10 Determine the standard deviation using mean method Difficulty: medium 5 11 Find the standard deviation of 'n' natural numbers Difficulty: hard 5 12 Determine the standard deviation using assumed mean method Difficulty: hard 5 13 Find the standard deviation using step deviation method Difficulty: hard 5

### Key Questions for School Exam Preparation

 1 Determine the range Difficulty: easy 2 2 Find the smallest value Difficulty: easy 2 3 Calculate the standard deviation Difficulty: hard 5 4 Find the remaining observation Difficulty: hard 5

### Teacher manual

 1 Methodical recommendation