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The number of students in 40 schools in a certain sub-county were recorded as follows:  
         238  100  173  115  398  597  572  299  
         255  750  587  403  250  217  797  386  
         362  486  453  279  436  248  780  316  
         529  305  372  286  842  235  420  492  
         226  245  695  720  267  617  198  830  

  1. Complete the frequency distribution table below for the data. 
     Number of students  100-199 200-249  250-399  400-599  600-799  800-849 
     Number of schools
  2. draw a histogram to represent the data. 
         
  3. Use the histogram to estimate the:  
    • median; 
    • number of schools with more than 350 students.  

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  1.  class tally  f  fd  cf 
     100-199   llll 4 0.04 4
     200-249  llll l 6  0.12  10 
     250-399  llll llll ll 12  0.08 22
     400-599  llll llll 10 0.05 32
     600-799  llll l 6 0.03 38
     800-849 ll 2 0.04 40

  2. Histogram answer
  3.  
    • Median psn=40/2 =20th value
         =10 + x × 0.08 = 20
      x = 125
      Median = 125+249.5
      =374.5
    • 49.5 × 0.08 + 10 + 6 + 2
      = 21.96
      ≈ 22 schools
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