Data & Probability — practice questions, page 7
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QuestionThe 100 members of a club are recorded by age group and sport. Juniors: Swimming 28, Athletics 12.…QuestionA pictograph of books read uses one symbol to stand for 8 books, and part-symbols are allowed.…QuestionA point is chosen at random inside a square ABCD. What is the probability that it lies inside the…QuestionThe mean of 10 numbers is 20. Five of them have mean 16. What is the mean of the other five?QuestionA pie chart shows the preferred subject of 720 students. Maths 150°, Science 120°, Arts 60°,…QuestionThree machines work independently. On a given day they break down with probabilities 1/5, 1/4 and…QuestionFive numbers are 7, 9, x, 12 and 15. Their mean is 10.4 and their mode is 9. Find the median.QuestionA dartboard is made of three concentric circles of radii 3 cm, 6 cm and 9 cm. A dart lands at a…QuestionFor the data 2, 4, 4, 5, 7, 8, 12 which of the following statements is correct?QuestionFor a set of 8 observations the sum of the deviations of the observations from 30 is 20. What is…QuestionA leap year is chosen at random. What is the probability that it contains 53 Sundays?QuestionA histogram is to be drawn for the distribution 0–10: 12, 10–20: 20, 20–40: 32, 40–70: 24 (class…QuestionThe mean weight of the boys in a class is 52 kg and the mean weight of the girls is 44 kg. The…QuestionTwo different numbers are picked at random from 1, 2, 3, 4, 5, 6, 7, 8, 9. What is the probability…QuestionIn 20 football matches a team's goals were recorded as — 0 goals in 4 matches, 1 goal in 6…QuestionIn a test every correct answer earns 4 marks and every wrong answer loses 1 mark. A student who…QuestionFamily P has a monthly income of ₹40,000 and spends 30 percent of it on food. Family Q has a…QuestionFind the standard deviation of the six numbers 4, 4, 4, 10, 10, 10.QuestionBag A holds 4 red and 6 white balls; Bag B holds 7 red and 3 white balls. One of the two bags is…QuestionThe runs scored in 15 innings are shown in a stem-and-leaf display, the stem being the tens digit…QuestionIn a grouped frequency distribution the class marks are 12, 20, 28, 36 and 44. Which class…QuestionA red die and a blue die, both fair, are rolled together. What is the probability that the number…QuestionFive positive integers have mean 10 and median 12. What is the greatest possible value of the…QuestionA number is chosen at random from the natural numbers 1 to 50. What is the probability that it is…QuestionA school's pass rate rose from 40 percent in 2023 to 50 percent in 2024. Which statement describes…
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