The following table shows the distribution of 1000 students’ scores in an exam:
Draw the ascending cumulative frequency curve, then determine the number of students whose scores are less than 85.
First form an ascending cumulative frequency table.
Then use the table to draw an ascending cumulative frequency curve. Locate 85 along the -axis and find the related frequency.
So, the number of students whose scores are less than 85 is 830.