The blood groups of 30 students of Class VIII are recorded as follows:Use this table to determine the probability that a student of this class, selected at random, has blood group AB.

The blood groups of 30 students of Class VIII are recorded as follows: A,B,O,O,AB,O,A,O,B,A,O,B,A,O,O, A,AB,O,A,A,O,O,AB,B,A,O,B,A,B,O. Use this table to determine the probability that a student of this class, selected at random, has blood group AB.

The blood groups of 30 students of a class VIII are recorded as follows : Represent this data in the form of a frequency distribution table. Which is themost common and which is the rarest blood group among these students ?

To know the opinion of the students about the subject statistics, a survey of 200 students was conducted. The data is recorded in the following table : Find the probability that a student chosen at random : likes statistics.

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.

In a particular section of Class IX, 40 students were asked about the months of their birth and the following graph was prepared for the data so obtained : Find the probability that a student of the class was born in August.

During the medial check up of 35 students of a class, their weights were recorded as follows: Draw a less than type ogive for the given data. Hence obtain the median weight from the graph and verify the result by using the formula.

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.

There are n students in a class. Ler P(E_lambda) be the probability that exactly lambda out of n pass the examination. If P(E_lambda) is directly proportional to lambda^2(0lelambdalen) . If P(A) be the probability that a student selected at random has passed the examination, then P(A), is