Probability important question class 11

Most important question class 10 chapter 4 Quadratic equation

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In a class two third students are boys and remaining are girls. The probability of getting first class by a boy is 0.30 and the probability of getting first class by a girl is 0.24. The probability of getting first class by a randomly selected student is:

Refer to Example 5, Section 14.4, Chapter 14. Find the probability that a student of the class was born in August.

In a particular section of class IX, 40 students were asked about the month 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.

The probability that in that in the loss of two dice we obtain the sum 7 or 11 is

The frequency chart shows test scores for a certain class. The total number of student is 31. If a student in the class was picked at random , what is the probability that the student's score was below 71 ?

The probability that a teacher will give an unannounced test during any class meeting is 1/5. If a student is absent twice, find the probability that the student will miss at least one test.

The probabilities of A , B and C solving a problem independently are respectively (1)/(4) , (1)/(5) , (1)/(6) . If 21 such problems are given to A , B and C then the probability that at least 11 problems can be solved by them is