probability super trick for class 10 students.

There are 5 brilliant students in class XI and 8 brilliant students in class XlIl.Each class has 50 students.The odds in favour of choosing the class XI are 2:3. One of the classes is chosen randomly and then a student is randomly selected.Find the probability of selecting a brilliant student.

Rohit collected the data regarding weights of students of his class and prepared the following table: A student is to be selected randomly from his class for some competition. The probability of selection of the student is highest whose weight is in the interval_______________

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:

Two thirds of the students in a class are boys and the rest girls.It is known that the probability of a girl getting a first class is 0.25 and that of a boy getting a first class is 0.28 find the probability that a student chosen at random will get first class marks in the subject.

The probabilities of a student getting first class or second class or third class in an examination are (2)/(7) , (3)/(5) ,(1)/(10) respectively . The probability that the students fails is .

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 ?

There are 5 students in class 10, 6 students in class 11 and 8 students in class 12. If the number of ways, in which 10 students can be selected from them so as to include at least 2 students from each class and at most 5 students from the total 11 students of class 10 and 11 is 100 k, then k is equal to _______.