Group B Welcome to your Group B 1. People were asked about the time in a week they spend in doing social work in their community. They said 10,7,13,20 and 15 hours respectively. Find the mean time in a week devoted by them for social work.15171312 2. The points scored by a kabaddi team in a series of matches are as follows : 17, 2, 7, 27, 15, 5, 14, 8, 10, 24, 48, 10, 8, 7, 18, 28. Find the median of the points scored by the team.14191712 3. Find the mean of the marks obtained by 30 students of class X of a school.10,20,36, 92,95,40,50,56,60,70,92,88,80,70,72,70,36,40,36,40,92,40,50,50,56,60,70,60,60,8859.259.358.758.9 4. The heights(in cm) of 9 students of a class are as follows:155,160,145,149,150,147,152,144,148 .Find the median of this data.247cm149cm125cm179cm 5. Find the mean of the first eight natural numbers.18.104.22.168.6 6. Find the mean of the first ten odd numbers.10203040 7. Find the mean of the first seven multiples of 510203040 8. Find the mean of all the factors of 20.4567 9. Find the mean of all prime numbers between 50 and 80.6564 3/766 3/766 1/7 10. The number of children in 10 families of a locality are 2, 4, 3, 4, 2, 0, 3, 5, 1, and 6. Find the mean number of children per family.9753 11. The following are the numbers of books issued in a school library during a week:105, 216, 322, 167, 273, 405 and 346.Find the average number of books issued per day.262267255286 12. If the mean of observations x,x+2,x+4, x+6 and x+8 is 11,find the value of x.3579 13. Find the median of:2, 10, 9, 9, 5, 2, 3, 7, 11.714911 14. Find the median of: 15, 6, 16, 8, 22, 21, 9, 18, 25.481216 15. Find the median of: 20, 13, 18, 25, 6, 15, 21, 9, 16, 8, 22481216 16. The following observation have been arranged in ascending order. If the median of the data is 63,find the value of X.29, 32, 48, 50, x, x+2, 72, 78, 84, 9562725242 17. The blood group of 30 students of class VIII are recorded as follows:A, B, O, O, AB, O,A,O,B,A,O,B,A,O,O,A,AB,O,A,A,O,O,AB,B,A,O,B,A,B,O.Represent this data in the form of a frequency distribution table. which is the most common , and which is the rarest, blood group among these students?O, ABA,BA,ABO,A 18. Three coins were tossed 30 times simultaneously. Each time the number of heads occurring was noted down as follows: 0,1,2,2,1,2,3,1,3,0,1,3,1,1,2,2,0,1,2,1,3,0,0,1,1,2,3,2,2,0Prepare a frequency distributed table for the data given above30202540 19. If the mean of five observations x, X+2, x+6, x+8, is 13, find the value of x and hence mean of the last three observations.15121718 20. The mean weight of 6 boys in a group is 48kg. the individual weights of five of them are 51kg, 45kg, 49kg, 46kg, and 44kg. find the weight of the sixth boy.45565367 21. The mean of the marks scored by 50 students was found to be 39.Later on it was discovered that a score of 43 was misread as 23. Find the correct mean.37.334.736.639.4 22. The means of 20 numbers is 43. If 6 is subtracted from each of the number , what will be the new means?32353739 23. Compute the median from the following data:marks 0-7 7-14 14-21 21-28 28-35 35-42 42-49number of students : 3 4 7 11 0 16 928262422 24. In a hospital, the ages of diabetic patients were recorded as follows. Find the median age.Age(in years) : 0-15 15-30 30-45 45-60 60-75No.of Patients: 5 20 40 50 2536.735.846.846.5 25. If the mean of the following frequency distribution is 24, find the value of p.class : 0-10 10-20 20-30 30-40 40-50frequency: 3 4 p 3 225183867 26. Development of a country can generally be determined by its:per capita incomeaverage literacy levelhealth status of its peoplenone of these 27. Different persons could have different as well as conflicting notions of a country’s development. A fair and just path for all should be achieved. Interpret the concept being discussed here.Social developmentCultural developmentNational developmentEconomic development 28. Proportion of literate population in the 7 and above age group is called as:Knowledge rateLiteracy rateAttendance rateExcellence Rate 29. For calculating Body Mass Index (BMI), weight of the person is divided by the:Square of the weightSquare of the heightSquare root of the heightSquare of the sum of height and weight 30. What proportion of the country is over using their groundwater reserves?One-FourthOne-TenthOne-Thirdhalf 31. Resources which will get exhausted after years of use are:Renewable resourcesNon-durable resourcesNon-renewable resourcesCompeting resources 32. What will be the top priority in the developmental goal of a landless labourer?Expansion of rural bankingMore days of work and better wagesMetal roads for transportationEstablishment of a high school 33. HDI stands for ‘Human Development Index’ that focuses on Fill in the blanks with one of the following options:life expectancygross enrolment ratio for three levels of schoolingnational incomeAll the above 34. What would be the most promising source of energy fifty years from now and why?Petroleum energy, because it is obtained from fossil fuels.Solar energy, because it is not exhaustible.Coal based energy, because it is pollution- free.Forest product based energy, because India has abundant forests. 35. Pick out the cause (from below) that enhances environmental degradation:Planting of trees.Prevention of factory wastes getting mixed up with river water.Ban on use of plastic bags.Allowing increase in the level of exhaust fumes emitted by cars, buses, trucks, etc. 36. Accounting furnishes data onIncome and cost for the managersFinancial conditions of the institutionsCompany’s tax liability for a particular yearAll the above 37. Gross profit isCost of goods sold + Opening stockExcess of sales over cost of goods soldSales fewer PurchasesNet profit fewer expenses of the period 38. Net profit is computed in theProfit and loss accountBalance sheetTrial balanceTrading account 39. What will be ratio of simple to compound interest on two same sums invested in SBI at rate of interest of 8% kept for 3 years?1875/20291/2.51903/21564/9 40. Raju invested Rs. 77500 in ICICI bank. In two years how much compound interest will he get, if the first year rate of interest was 10% and second year had 2% more than first year? Rs. 17850Rs. 17980Rs. 18963Rs. 16880 41. What will be difference in population 3 years ago and 2 years ago of Devon village, whose current population is 100000 and which is increasing at a rate of 25% every year? 15250139001640012800 42. Raj has Rs. 1301 with him. He divided it amongst his sons Prakash and Prashant and asked them to invest it at 4% rate of interest compounded annually. It was seen that Prakash and Prashant got same amount after 17 and 19 years respectively. How much did Raj give to Prashant?Rs. 705Rs. 615Rs. 676Rs. 625 43. The probability of each event, when a coin is tossed for 1000 times with frequencies: Head:455 & Tail: 545 is:0.455 & 0.5450.5 & 0.5has0.45 & 0.55455 & 545 44. The sum of all probabilities equal to:4132 45. The probability of each event lies between1 & 21 & 100 & 10 & 5 46. Three coins were tossed 200 times. The number of times 2 heads came up is 72. Then the probability of 2 heads coming up is:1/252/257/259/25 47. A batsman hits boundaries for 6 times out of 30 balls. Find the probability that he did not hit the boundaries. ⅕⅖⅗⅘ 48. If P(E) = 0.44, then P(not E) will be:0.440.550.500.56 49. If P(E) = 0.38, then probability of event E, not occurring is:0.620.380.481 50. The probability of drawing an ace card from a deck of cards is:1/521/264/131/13 Time is Up! 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