Question

The percentage of marks obtained by a student in the monthly unit test are given below :


For further instructions follow the attachment.


​

Answer 1

$\huge\boxed{\fcolorbox{orange}{violet}{Answer}}$

Solution:-

Total number of unit tests held = 5

(i) Number of unit test in which the student gets a first class that is at least 60% marks =4

∴ Probability that the student gets a first class

$= \frac{4}{5} = 0.8$

(ii) Number offer test in which the student gets marks between 70% and 80% = 2

∴ Probability that a student gets marks between 70% and 80%

$= \frac{2}{5} = 0.4$

(iii) Number of test in which the student gets distinction = 2

∴ Probability that the student gets distinction

$= \frac{2}{5} = 0.4$

(iv) Number of Tests in which the student gets less than 65% marks = 2

∴ Probability that a student gets less than 65% marks

$= \frac{2}{5} = 0.4$

Answer 2

Answer:

Total number of unit tests held = 5

(i) Number of unit test in which the student gets a first class that is at least 60% marks =4

∴ Probability that the student gets a first class

= \frac{4}{5} = 0.8=

5

4

=0.8

(ii) Number offer test in which the student gets marks between 70% and 80% = 2

∴ Probability that a student gets marks between 70% and 80%

= \frac{2}{5} = 0.4=

5

2

=0.4

(iii) Number of test in which the student gets distinction = 2

∴ Probability that the student gets distinction

= \frac{2}{5} = 0.4=

5

2

=0.4

(iv) Number of Tests in which the student gets less than 65% marks = 2

∴ Probability that a student gets less than 65% marks

= \frac{2}{5} = 0.4=

5

2

=0.4