Question

The table given below shows the marks obtained by 30 students

in a test.



Marks

(class interval) 1 - 10 11 - 20 21 – 30 31 – 40 41 – 50

Number of

students

7 10 6 4 3



Out of these students, one student is selected at random. What

is the probability that the marks of the chosen student

(i) lie in the interval 21-30

(ii) are more than ​

Answer 1

Answer:

1) 6

2) more than what

Step-by-step explanation:

please send completely question

Answer 2

Answer:

• It is given that Total number of students = 30

1. (i) We know that Probability that the marks of the chosen students are 30 or less = (7 + 10 + 6)/ 30 So we get Probability that the marks of the chosen students are 30 or less = 23/30
2. (ii) We know that Probability that the marks of the chosen students are 31 or more = (4 + 3)/30 So we get Probability that the marks of the chosen students are 31 or more = 7/30
3. (iii) We know that Probability that the marks of the chosen students lie in the interval 21 – 30 = 6/30 So we get Probability that the marks of the chosen students lie in the interval 21 – 30 = 1/5