PDF chapter test TRY NOW
1. Marks of the students in a particular subject of a class are given below.
| Marks | \(0 - 10\) | \(10 - 20\) | \(20 - 30\) | \(30 - 40\) | \(40 - 50\) | \(50 - 60\) | \(60 - 70\) |
| Number of students | \(8\) | \(12\) | \(17\) | \(14\) | \(9\) | \(7\) | \(4\) |
Find its standard deviation.
Answer:
The standard deviation is
2. The mean and standard deviation of \(15\) observations are found to be \(10\) and \(5\) respectively. On rechecking it was found that one of the observation with value \(8\) was incorrect. Calculate the correct mean and standard deviation if the correct observation value was \(23\)?
Answer:
Correct mean \(=\)
Correct standard deviation \(=\)
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