NCERT Solutions for Class 9 Maths<\/a> Chapter 14 Statistics Ex 14.2 Questions and Answers are prepared by our highly skilled subject experts.<\/p>\nNCERT Solutions for Class 9 Maths Chapter 14 Statistics Exercise 14.2<\/h2>\n Question 1. \nThe blood groups of 30 students of class VIII are recorded as follows: \nA, B, O, O, AB, O, A, O, B, A, O, B, A, O, O, \nA, AB, O, A, A, O, O, AB, B, A, O, B, A, B, O. \nRepresent 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. \nSolution: \nThe frequency distribution table of the following data is as: \n \nThe most common blood group is O, and the rarest blood group is AB among the students.<\/p>\n
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Question 2. \nThe distance (in km) of 40 female engineers from their residence to their place of work was found as follows: \n \nConstruct a grouped frequency distribution table with class size 5 for the data given above, taking the first interval as 0-5 (5 not included). What main features do you observe from this tabular representation? \nSolution: \nUpper limit = 32 \nLower limit = 2 \nRange = 32 – 2 = 30 \n \nWe observe that more than 60% of female engineers’ residence to their place of work were less than 15 km.<\/p>\n
Question 3. \nThe relative humidity (in %) of a certain city for a month of 30 days was as follows: \n \n(i) Construct a grouped frequency distribution table with classes 84 – 86, 86 – 88 etc. \n(ii) Which month or season do you think this data is about? \n(iii) What is the range of this data? \nSolution: \n(i) Upper limit = 99.2 \nLower limit = 84.9 \nRange = 14.3 \n \n(ii)The given data is to be taken in the rainy season as the relative humidity is high. \n(iii) The range of this data is 99.2 – 84.9 = 14.3<\/p>\n
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Question 4. \nThe height of 50 students, measured to the nearest centimeter have been found to be as follows: \n \n(i) Represent the data given above by a grouped frequency distribution table, taking the class intervals as 160 – 165, 165 – 170, etc. \n(ii) What can you conclude about their height from the above table. \nSolution: \n(i) Upper limit = 173 \nLower limit = 150 \nRange = 173 – 150 = 23 \n \n(ii) One conclusion that we can draw from the above table is that more than 50% of students are shorter than 165 cm.<\/p>\n
Question 5. \nA study was conducted to find out the concentration of sulphur dioxide in the air in parts per million (ppm) of a certain city, The data obtained for 30 days is as follows: \n \n(i) Make a grouped frequency distribution table for this data with class intervals as 0.00 – 0.04, 0.04 – 0.08, and so on. \n(ii) For how many days, was the concentration of sulphur dioxide more than 0.11 parts per million? \nSolution: \n(i) Upper limit = 0.22 \nLower limit = 0.01 \nRange = 0.21 \n \n(ii) The concentration of sulphur dioxide was more than 0.11 ppm for 8 days.<\/p>\n
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Question 6. \nThree coins were tossed 30 times simultaneously. Each time the number of heads occurring was noted down as follows: \n \nPrepare a frequency distribution table for the data given above. \nSolution: \nThe frequency distribution table of the given data is \n \n <\/p>\n
Question 7. \nThe value of \u03c0 upto 50 decimal places is given below: \n3.14159265358979323846264338327950288419716939937510 \n(i) Make a frequency distribution of the digits from 0 to 9 after the decimal point. \n(ii) What are the most and the least frequently occurring digits? \nSolution: \n(i) Frequency distribution table of the digits after the decimal point is: \n \n(ii) The most frequently occurring digits are 3 and 9. The least occurring digits are 0.<\/p>\n
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Question 8. \nThirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows: \n \n(i) Make a grouped frequency distribution table for this data, taking class width 5 and one of the class intervals as 5 – 10. \n(ii) How many children watched television for 15 or more hours a week? \nSolution: \nUpper limit = 17 \nLower limit = 1 \nRange = 17 – 1 = 16 \n \n(ii) Number of children who watched television for 15 or more hours a week is 2 children.<\/p>\n
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Question 9. \nA Company manufactures car batteries of a particular type. The lives (in years) of 40 such batteries were recorded as follows: \n \nConstruct a grouped frequency distribution table for this data, using class intervals of size 0.5 starting from the interval 2 – 2.5: \nSolution: \nUpper limit = 4.6 \nLower limit = 2.2 \nRange = 2.4 \n <\/p>\n","protected":false},"excerpt":{"rendered":"
These NCERT Solutions for Class 9 Maths Chapter 14 Statistics Ex 14.2 Questions and Answers are prepared by our highly skilled subject experts. NCERT Solutions for Class 9 Maths Chapter 14 Statistics Exercise 14.2 Question 1. The blood groups of 30 students of class VIII are recorded as follows: A, B, O, O, AB, O, …<\/p>\n
NCERT Solutions for Class 9 Maths Chapter 14 Statistics Ex 14.2<\/span> Read More »<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","spay_email":""},"categories":[6],"tags":[],"yoast_head":"\nNCERT Solutions for Class 9 Maths Chapter 14 Statistics Ex 14.2 - MCQ Questions<\/title>\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\t \n\t \n\t \n