Data & Probability — practice questions, page 8
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QuestionFind the mean deviation about the MEDIAN for the data 5, 7, 9, 11, 38.QuestionA box holds 10 pens, of which 3 are defective. Three pens are taken out together at random. What…QuestionA shoe shop owner wants to decide which size to stock in the largest quantity. Which average of…QuestionA jar contains 3 lemon sweets and 5 orange sweets. A sweet is drawn at random, its flavour is…QuestionA train's timetable reads — leaves Patna 06:40, reaches Gaya 08:25, leaves Gaya 08:35, reaches…QuestionFor the nine values 12, 15, 18, 20, 22, 25, 28, 30, 35 (already in ascending order) find the…QuestionAll the letters of the word SUCCESS are arranged at random in a row. What is the probability that…QuestionIn a housing colony the number of adults and the number of children are in the ratio 7 : 3. The…QuestionA three-digit PIN is formed by choosing each of its three digits at random from 0 to 9,…QuestionOf the 300 people in a survey, 180 were men and the rest women. Altogether 190 people answered…QuestionFind the standard deviation of the first seven natural numbers.QuestionOn any day the probability of rain in a town is 0.4. On a rainy day the probability that Meera…QuestionIn a frequency table the classes are written in the inclusive form 10–19, 20–29, 30–39 and so on.…QuestionOne of the positive factors of 60 is chosen at random. What is the probability that it is an even…QuestionA stationery stall's day book shows — Pens: 120 sold at ₹15 each. Pencils: 200 sold at ₹6 each.…QuestionThe mean of 25 observations is 36. The mean of the first 13 of them is 32 and the mean of the last…QuestionThe probability that Arun solves a certain problem is 2/3 and the probability that Bina solves it…QuestionEach of these four data sets has mean 10. Which of them has the LARGEST standard deviation?QuestionA white die and a black die, both fair, are rolled. What is the probability that the number on the…QuestionThe number of visitors to a museum on five days was Monday 240, Tuesday 180, Wednesday 300,…QuestionThe 'less than' ogive and the 'more than' ogive of the same grouped distribution are drawn on one…QuestionFor two events A and B it is given that P(A) = 0.42, P(B) = 0.48 and P(A ∩ B) = 0.16. Find P(A′ ∩…QuestionA cyclist noted her odometer, which shows the total distance covered so far, at the end of each…QuestionA purse holds three ₹5 coins and two ₹10 coins. One coin is taken out at random. What is the…QuestionThe ages of eight cousins at a family gathering are 13, 17, 11, 20, 15, 22, 14 and 19 years. The…
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