The table given below shows the months of birth of 36 students of a class :

A student is chosen at random from the class . What is the probability that the chosen student was born in October ?

The table given below shows the months of birth of 40 students of a class in a school . If one student is chosen at random , what is the probability that the student is born (i) in the latter half of the year ? (ii) in a month having 31 days ? (iii) in a month having 30 days ?

The table given below shows the marks out by 30 students in a test . Out of these students , one is chosen at random . What is the probability that the marks of the chosen student ? (i) are 30 or less (ii) are 31 or more ? (iii) lie in the interval 21-30 ?

The following table shows the blood groups of 40 students of a class. One student of the class is chosen at random . What is the probability that the chosen student has blood group (i) O ? (ii) AB ?

A teacher chooses a student at random from a class of 30 boys. What is the probability that the student chosen is a boy?

Following frequency distribution gives the weights of 40 students of a class . A student from the class is chosen at random . What is the probability that the weight of the chosen student is (i) at most 60 kg (ii) at least 56 kg (iii) not more than 50 kg ?

There are 20 boys and 15 girls in a class of 35 students . A student is chosen at random . Find the probability that the chosen student is a (i) boy (ii) girl .

In a medical examination of students of a class , the following blood groups are recorded : From this class , a student is chosen at random . What is the probability that the chosen student has blood group AB ?

The table given below shows the marks obtained by 50 students of a class in a test with maximum 2. marks 100. A student of the class is selected at random. Find the probability that the selected student gets less than 15% marks