Class 9 – Statistics

Question 9: A company manufactures car batteries of a particular type. The lives (in years) of 40 such batteries were recorded as follows: 2.6 3.5 2.5 3.5 4.6 3.0 3.7 2.3 3.2 4.4 3.4 3.2 3.9 3.8 3.2 3.2 2.2…

Question 8: Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows: 1 6 2 3 5 12 5 8 4 8 10 3 4 12 2…

Question 7: The value of π upto 50 decimal places is given below: 3.14159265358979323846264338327950288419716939937510 Make a frequency distribution of the digits from 0 to 9 after the decimal point. What are the most and the least frequently occurring digits? Question…

Question 6: 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…

Question 5: A 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: 0.03 0.08 0.08 0.16 0.05…

Question 4: The heights of 50 students, measured to the nearest centimetres, have been found to be as follows: 161  150 154 162  164 171 153  159 161 154  152 153 161 159 162 165 168 165 158 170 162…

Question 3: The relative humidity (in %) of a certain city for a month of 30 days was as follows: 98.1 98.6 89.2 92.3 96.2 92.1 99.2 90.3 97.1 93.5 84.9 90.2 86.5 95.3 92.9 96.3 92.7 95.1 97.2 93.3…

Question 2: The distance (in km) of 40 engineers from their residence to their place of work were found as follows: 5 3 10 20 25 11 13 7 12 31 19 10 12 17 18 11 32 17 16…