There are 60 students in a class. The following is the frequency distribution of the marks obtained by the students in a test:
Marks |
0 |
1 |
2 |
3 |
4 |
5 |
Frequency |
x-2 |
x |
x2 |
(x+1)2 |
2x |
x+1 |
where x is a positive integer. Determine the mean and standard deviation of the marks.