### 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

### Exercises

 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 3 6 Calculate the standard deviation by direct method Difficulty: medium 3 7 Calculate the standard deviation by mean method Difficulty: medium 3 8 Calculate the standard deviation by assumed mean method Difficulty: medium 3 9 Calculate the standard deviation by step deviation method Difficulty: medium 3 10 Determine the standard deviation using mean method Difficulty: medium 4 11 Find the standard deviation of 'n' natural numbers Difficulty: hard 4 12 Determine the standard deviation using assumed mean method Difficulty: hard 4 13 Find the standard deviation using step deviation method Difficulty: hard 4

### Tests

 1 Training test I Difficulty: medium 7 2 Training test II Difficulty: medium 8

### Teacher manual

 1 Methodical recommendation