Collect the details and find the probabilites of selecting a boy from tenth standard in your school.

Collect the details and find the probabilites of selecting a student from tenth standard in your school.

Collect the details and find the probabilites of selecting a boy from you class.

Collect the details and find the probability of selecting a girl from you class.

80 bulbs are selected at random from a lot and their life time (in hours) is recorded in the form of a frequency table given below. Find the probability that bulbs selected randomly from the lot has life less than 900 hours.

Suppose that 120 students are studying in 4 sections of eleventh standard in a school. Let A denotes the set of students and B denote the set of the sections. Define a relation from A to B as "x related to y if the student x belongs to the section y". Is this relation a function ? What can you say about the inverse relation ? Explain your answer.

In a class of 35, students are numbered from 1 to 35. The ratio of boys to girls is 4 : 3. The roll numbers of students begin with boys and end with girls. Find the probability that a student selected is either a boy with prime roll number or a girl with composite roll number or an even roll number.

In Class XI of a school 40 % of the students study Mathematies and Biology. If a student is selected at random from the class, find the probability that he will be studying Mathemetics or Biology.