Question

The percentage of marks obtained by a student is monthly unit test are given below
unit test 1 ,2 3,4,5
% of marks obtained 70, 72 ,65, 68,85
find the Probability that the student gets:
(1)more than 70 % marks
(2)Less than 70 % marks
(3) more than 90% marks.​

Answer 1

Answer:

1. 3/5

2. 2/5

3. 0

Step-by-step explanation:

1. Let E be the event for getting more than 70%.

no. of sample spaces for event E = 3 = n(E)

total no. of sample space = 5 = n(S)

therefore ,

probability of E = n(E) / n(S)

= 3/5

2. Let F be the event for getting less than 70%.

no. of sample spaces for event F = 2 = n(F)

total no. of sample space = 5 = n(S)

therefore ,

probability of F = n(F) / n(S)

= 2/5

3. no sample space is more than 90 % , so probability is zero.