Data & Probability — practice questions, page 6
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QuestionA point P is chosen at random on a straight segment AB of length 12 cm whose midpoint is M. What…QuestionA traffic signal repeats a cycle of green for 25 seconds, amber for 5 seconds and red for 30…QuestionTwo fair dice are thrown and the numbers are added. Which is likelier — that the sum is a multiple…QuestionTwo fair dice are thrown and the numbers are added. Which of these pairs of sums are equally likely?QuestionIn a game a player pays ₹10 to roll a fair die once. If a six appears the player receives ₹x, and…QuestionAnil and Bhavna play a game in which a fair coin is tossed twice. Anil wins if at least one head…QuestionIn a game three fair coins are tossed. The player wins ₹5 if all three coins show the same face…QuestionA bag holds 5 red and 3 blue balls. Two balls are drawn. Let p be the probability that both are…QuestionThree people step into a building that has 4 lifts. Each person picks a lift at random,…QuestionThe digits 1, 2, 3 and 4 are arranged at random, each used exactly once, to form a four-digit…QuestionFive cards numbered 1 to 5 are shuffled and laid out in a row in positions numbered 1 to 5. What…QuestionIn a group of 80 students, 40 study Music, 35 study Dance and 30 study Drama. Also 15 study Music…QuestionIn a survey of 120 people, 60 use app P, 55 use app Q and 45 use app R; 25 use both P and Q, 20…QuestionGroup A consists of the five values 3, 7, 9, 15, 21 and Group B of the four values 5, 11, 13, 25.…QuestionSet P has 5 numbers with mean 20 and Set Q has 15 numbers with mean 28. Which statement about the…QuestionA class has 30 students. The mean mark of the 12 boys is 68 and the mean mark of the whole class…QuestionThree tour groups have 10, 15 and 25 members with mean ages 30 years, 24 years and x years. The…QuestionA car covers 60 km at 30 km/h, then 80 km at 40 km/h, then 100 km at 25 km/h. What is its average…QuestionThe mean of 9 observations is 16. What must a tenth observation be so that the mean of all 10…QuestionSix readings were recorded as 9, 11, 14, 16, 18, 21. Later the reading 14 was found to be a…QuestionSix readings were recorded as 3, 8, 10, 12, 18, 21. Later it was found that the reading 10 should…QuestionThe five scores of two teams were recorded. Team A: 32, 35, 38, 40, 45. Team B: 20, 36, 38, 40,…QuestionA company's yearly profit is drawn as a bar chart whose vertical axis starts at 40 instead of at…QuestionIn a sales chart the bar for Product X is drawn three times as tall as the bar for Product Y. The…QuestionA survey of 240 people is recorded in a two-way table. Under 30: Yes 84, No 36. Aged 30 or above:…
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