Data & Probability — practice questions, page 10
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QuestionA drawing pin was dropped 400 times and it landed point up on 260 of those drops. On the evidence…QuestionA 'less than' table of scores reads — less than 20: 7, less than 40: 22, less than 60: k, less…QuestionThe mean of a list of numbers is 42. When one more number, 66, is written at the end of the list,…QuestionTwo numbers x and y are each chosen at random from 1, 2, 3, 4, the two choices being independent…QuestionIn a test the highest mark is 72 and the lowest is 42. Every mark is first increased by 8 and then…QuestionA bag holds red and blue marbles in the ratio 3 : 5. Four more red marbles are dropped in, and a…QuestionA single bar 30 cm long represents all 60 students of a class and is divided in proportion to how…QuestionThe five numbers 8, 12, x, 20, 26 are written in ascending order, and the mean of the five equals…QuestionAll four aces and all twelve face cards are taken out of a standard pack of 52 playing cards. One…QuestionThe mean of 20 numbers is 45. One of the numbers is increased by 60 and nothing else changes. By…QuestionA road atlas gives these distances. Route A: Delhi to Agra 233 km, then Agra to Kanpur 285 km.…QuestionTwelve tickets numbered 1 to 12 are put in a box and two of them are drawn together at random.…QuestionVikram has scored 68, 74, 81 and 77 in four unit tests. What must he score in the fifth test to…QuestionA school year had 240 working days and a student attended 198 of them. The school requires at…QuestionA wooden die used in a board game is not an ordinary one: its six faces carry the numbers 1, 1, 2,…QuestionA cricket coaching camp runs two batches. Batch A has 24 players with mean age 15 years, and Batch…QuestionTwo hundred commuters were classified by how they travel and by whether they hold a monthly pass.…QuestionA set of 12 readings has mean 34 and median 31. Every reading is multiplied by 5 and then 12 is…QuestionA box holds 5 green tokens and 3 yellow tokens. Tokens are taken out one at a time at random and…QuestionThe heights of 60 saplings in a nursery, in centimetres, are grouped as 20–35: 8, 35–50: 10,…QuestionA pie chart shows how the 1,800 books of a school library are divided among four sections. The…QuestionIn a quality check three inspectors examine the same batch independently. The probabilities that…QuestionThe deviations of six observations from their own mean are −5, 3, x, −2, 7 and −1. Find x.QuestionA fête stall's wheel is divided into three sectors — red 120°, blue 90° and green 150°. The wheel…QuestionA survey of 40 households recorded the number of children in each — 0 children: 4 households, 1…
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