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Statistics (Quartiles and Percentiles)
Quartiles and Percentiles Practice 1

1.
 The cumulative frequency curve shows the times taken by 100 students to
 
 complete a test.Use the graph to find
 (a) the number of students who took less that 45 minutes to complete the test,
 (b) the percentage of students who took more than 50 minutes to complete the
   test.