Following are the marks obtained (Out of 50) by the students in a class. | |
Marks | No. of Students |
10-20 | 8 |
20-30 | X |
30-40 | 9 |
40-50 | 6 |
One student from the class is selected at random. If the, probability that his marks is 20 or more but less than 40, is \[\frac{\mathbf{5}}{\mathbf{7}}\], then find the value of x. |
A) 13
B) 18
C) 6
D) 26
E) None of these
Correct Answer: D
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