Note: This is the Solution of review exercise 13.2 from newly published book by PCTB (Punjab Curriculum and Textbook Board, Pakistan) for new 9th session 2025 Onward.
Exercise 13.2
Question 1: A researcher collected data on number of deaths from Horse-Ricks in Russian Army crops over the years. The table is as follows:
Find the relative frequency of the given data.
Question 2: The frequency of defective products in \(\small{750}\) samples are shown in the following table. Find the relative frequency for the given table.
Question 3: A quiz compition on general knowledge is conducted. The number of corrected answers out of \(\small{5}\) questions for \(\small{100}\) sets of questions is given below.
Find the relative frequency of the given data.
Question 4: A survey was conducted from the \(\small{50}\) students of a class and asked their favourite fodd. The responses are as under:
\( (i) \; \) How many percentages of students like biryani?
\( (ii) \; \) How many percentages of students like chicken?
\( (iii) \; \) Which food is the least like by the students?
\( (iv) \; \) Which food is the most prefer by the students?
Question 5: In 500 trials of a thrown of two dice, what is expected frequency that the sum will be greater than \(\small{8}\)?
Question 6: What is the expectation of a person who is to get Rs. \(\small{120}\) if he obtains at least \(\small{2}\) heads in single toss of three coins?
Question 7: Find the expected frequencies of the given data if the experiment is repeated \(\small{200}\) times.
