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Question 1
00:00
A random variable X has the distribution law as given below:
The variance of the distribution is
| X | 1 | 2 | 3 |
| P(X=x) | 0.3 | 0.4 | 0.3 |
Question 2
In a group of 200 students, the mean and the standard deviation of scores were found to be 40 and 15,
respectively. Later on it was found that the two scores 43 and 35 were misread as 34 and 53, respectively. The corrected mean of scores is: