Class 9 – Probability

Question 13: In Q.1, Exercise 14.2, you were asked to prepare a frequency distribution table regarding the blood groups of 30 students of a class. Use this table to determine the probability that a student of this class, selected at…

Question 12: In Q.5, Exercise 14.2, you were asked to prepare a frequency distribution table, regarding the concentration of sulphur dioxide in the air in parts per million of a certain city for 30 days. Using this table, find the…

Question 11: Eleven bags of wheat flour, each marked 5kg, actually contained the following weights of flour (in kg): 4.97 5.05 5.08 5.03 5.00 5.06 5.08 4.98 5.04 5.07 5.00 Find the probability that any of these bags chosen at…

Question 10: Activity : Ask all the students in your class to write a 3-digit number. Choose any student from the room at random. What is the probability that the number written by her/him is divisible by 3? Remember that…

Question 9: Activity : Note the frequency of two-wheelers, three-wheelers and four-wheelers going past during a time interval, in front of your school gate. Find the probability that any one vehicle out of the total vehicles you have observed is…

Question 8: Refer to Q.2, Exercise 14.2. What is the empirical probability that an engineer lives: less than 7 km from her place of work? more than or equal to 7 km from her place of work? within 1/2 km…

Question 7: 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 (i) likes statistics,…

Question 6: Refer to Table 14.7, Chapter 14. Find the probability that a student obtained less than 20% in the mathematics test. Find the probability that a student obtained marks 60 or above. Question 5 Question 7

Question 5: An organisation selected 2400 families at random and surveyed them to determine a relationship between income level and the number of vehicles in a family. The information gathered is listed in the table below: Suppose a family is…