MHT CET Mathematics question
Consider the following frequency distribution
| Class | 0 - 10 | 10 - 20 | 20 - 30 | 30 - 40 | 40 - 50 | 50 - 60 | |---|---|---|---|---|---|---| | Frequency | 11 | 29 | 18 | 4 | 5 | 3 |
Which of the following is/are true? I. Mean of the data is . II. Variance of the data is . III. Standard deviation of the data is .
Answer: (C)
Solution
Mid values with : , so the mean is and statement I is true. , so the variance is $ - = 602.14 - 441
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