Basic statistics revision

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Basic statistics revision

  1. 1. 1
  2. 2. Bar charts 2
  3. 3. Pictograms 3
  4. 4. 4
  5. 5. Pie charts 5
  6. 6. Food pyramid pie chart 6
  7. 7. The mean The mean is also known as the common average.Find the mean of this set of data: 7,  5,  2,  6,  12,  10,   4,  8,  9 7
  8. 8. The modeThe mode is the data value that occurs most frequently.The following are the number of matches found in 14 boxes randomly chosen.The mode number of matches is......... 8
  9. 9. The medianThe median value of a set of data is the value in the middle once the data has been ordered. 7,  5,  2,  6,  12,  10,   4,  8,  9,  3 9
  10. 10. 10
  11. 11. The table shows the marks otained by a group of students. mark 1 2 3 4 5 6frequency 5 9 16 18 20 7• Find the total number of students in this sample n=75• Find the mean mark mean =3.8• Find the median mark. median =4• What is the mode of this distribution? mode=5 11
  12. 12. The rangeThe range is a measure of spread and it is  largest data value­ smallest data value range:7,  5,  2,  6,  12,  10,   4,  8,  9 range: mark 1 2 3 4 5 6 range:frequency 5 9 16 18 20 7 12
  13. 13. The heights of dogs have been measured Heights ( mm) mean = 394 mm 600 470 median = 430 mm 170 300 430 range = 430 13

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