Mathematics
The marks scored by 100 students are given below:
| Marks scored | No. of students |
|---|---|
| 0-10 | 4 |
| 10-20 | 5 |
| 20-30 | 9 |
| 30-40 | 7 |
| 40-50 | 13 |
| 50-60 | 12 |
| 60-70 | 15 |
| 70-80 | 11 |
| 80-90 | 14 |
| 90-100 | 10 |
A student in the class is selected at random. Find the probability that the student has scored:
(a) less than 20
(b) below 60 but 30 or more
(c) more than or equal to 70
(d) above 89.
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(b) the value of x and y.
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