Mathematics

Problem

For the following frequency distribution of test scores, find the standard deviation (in marks) correct to two decimal places. Class (marks): 0–10 | 10–20 | 20–30 | 30–40 Frequency: 5 | 8 | 12 | 5 a) 10.55 b) 11.18 c) 9.55 d) 9.70

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