UPSKILL MATH PLUS

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50 students enter for a school Javelin throw competition. The distance (in metre) thrown are recorded below.
 
Distance m 0-20 20-40 40-60 60-80 80-100
Number of students 6 11 17 12 4
 
Construct the cumulative frequency table and  calculate the median distance.
 
Answer:
  
The median distance =  m.
 
[Note: Enter the answer in two decimal number.]