The percentage of marks obtained by a student in the monthly unit tests are given below :
Based on this data, find the probability that the student gets more than 70% marks in the next unit test.

The percentage of marks obtained by a student in the monthly unit tests are given below: Based on this data, find the probability that the student gets more than 70% marks in a unit test.

Refer the data: Find the probability that a student obtained less than 20% in the mathematics test.

Marks obtained by 2500 students are shown in the following table: A student is selected at random. Find the probability that : he scores more than 80% marks.

Refer the data: Find the probability that a student obtained marks 60 or above.

Marks obtained by 2500 students are shown in the following table: A student is selected at random. Find the probability that : he scores less than 60% marks.

A teacher analyses the performance of two sections of students in a mathematics test of 100 marks given in the following table : : Find the probability that a student obtained less than 20% in the mathematics test.

A teacher analyses the performance of two sections of students in a mathematics test of 100 marks given in the following table : : Find the probability that a student obtained less than 20 marks in the mathematics test.

How many times must a fair coin be tossed so that the probability of getting at least one head is more than 80%?

How many times must a man toss a fair coin so that the probability of getting at least one head is more than 90%?

How many times must a man toss a fair coin so that the probability of getting at least one head is more than 90%?