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Basic statistics revision Basic statistics revision Presentation Transcript

  • 1
  • Bar charts 2
  • Pictograms 3 View slide
  • 4 View slide
  • Pie charts 5
  • Food pyramid pie chart 6
  • 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
  • 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
  • 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
  • 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
  • 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
  • The heights of dogs have been measured Heights ( mm) mean = 394 mm 600 470 median = 430 mm 170 300 430 range = 430 13