Gobezoch › Textbooks › Mathematics Grade 9

Mathematics Grade 9 Unit 9: Statistics and Probability

national exam questions have come from this unit. It runs 54 pages; one careful study pass takes about 4.9 hours, and its difficulty is harder among Mathematics units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.

Read this unit
9.1 Statistical Data · read p. 311
Not asked in a national paper yet.
9.2 Probability · read p. 311
  • 2018 E.C., Q36 – There are three red, four yellow and three green balls in a bag. If two balls are picked randomly from the bag at a time, what is the probability of getting at least one green ball?
  • 2018 E.C., Q38 – Two six face dice are thrown at a time. What is the probability of getting the sum of the outcome is a prime number?
  • 2018 E.C., Q40 – In a household, there are three mothers, six daughters and four granddaughters living together. What is the smallest possible number of females in the house?
  • 2018 E.C., Q2 – In an experiment of rolling a die, what is the probability of getting 1 or 5?
  • 2018 E.C., Q20 – Given the data: 10, 4, 2, 8, 2, 4. What is the standard deviation of the given data?
  • 2017 E.C., Q28 – The following is raw data of 15 students in a test: 9, 6, 6, 10, 6, 10, 9, 7, 7, 5, 9, 7, 10, 7, 7 Which one of the following is frequency distribution of the given data?
  • 2017 E.C., Q17 – If a fair six-sided die is tossed once, then what is the probability of getting a factor of 4?
  • 2016 E.C., Q6 – Let $\bar{x}$ denote the arithmetic mean of a numerical data. If each observation is multiplied by 0.5, which of the following is the new mean?
  • 2016 E.C., Q19 – Which one of the following is a primary data?
  • 2015 E.C., Q21 – A group of students, 5 from grade 10, 8 from grade 11 and 2 from grade 12 is to be formed. If a student is chosen randomly from this group, what is the probability that the chosen student is either from grade 10 or grade
  • 2015 E.C., Q17 – If we toss a coin three times, what is the number of possible events of getting at least two heads?
  • 2015 E.C., Q3 – The histogram below shows the recorded temperature (in °C) of a certain town in Ethiopia for the first 15 days of March 2023. Then which one of the following statement is true about the data represented by the histogram?
  • 2013 E.C., Q24 – The following table shows the mean and standard deviation of expenditures in Birr of three factories F1, F2, and F3, in a week. F1 F2 F3 Mean 12,500 12,500 2,500 Standard deviation 3.62 3.56 3.6 Which factory or factorie
  • 2013 E.C., Q59 – Math test scores distribution of 20 students is given as in Table 2 below? Scores 1 - 5 6 - 10 11 - 15 16 - 20 Frequency 4 6 8 2 What is the standard deviation of the scores?