UPSKILL MATH PLUS
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1. Find the mean and variance of the first \(n\) natural numbers.
Answer:
Mean \(=\)
Variance \(=\)
2. \(48\) students were asked to write the total number of hours per week they spent on watching television. With this information find the standard deviation of hours spent for watching television.
| \(x\) | \(6\) | \(7\) | \(8\) | \(9\) | \(10\) | \(11\) | \(12\) |
| \(f\) | \(3\) | \(6\) | \(9\) | \(13\) | \(8\) | \(5\) | \(4\) |
Answer:
The standard deviation \(=\)
3. The marks scored by the students in a slip test are given below. Find the standard deviation of their marks.
| \(x\) | \(4\) | \(6\) | \(8\) | \(10\) | \(12\) |
| \(f\) | \(7\) | \(3\) | \(5\) | \(9\) | \(5\) |
Answer:
The standard deviation \(=\)
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