04Cumulative Frequency Tables and Graphs

04Cumulative Frequency Tables and Graphs - CUMULATIVE...

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C UMULATIVE F REQUENCY T ABLES AND G RAPHS A cumulative frequency distribution shows the accumulated frequencies of the table. Ex . A cumulative frequency distribution showing litres of fizzy cola syrup sold by 50 employees of Slimline Beverage Company in 1 week. Litres Sold Number of Employees <80 0 <90 2 <100 8 <110 18 <120 32 <130 41 <140 48 <150 50 How many employees sold between 110 and 120 litres? 32 – 18 = 14 employees. The graphic presentation of a cumulative frequency distribution is called a cumulative frequency graph/curve or an ogive (oh jive). To find the median, find the halfway point of the cumulative frequencies (25) and draw a straight line to the curve. Then draw a straight line down to the x-axis to find the median value. A quartile contains a quarter of the data values. The lower quartile ( Q1 ) is the value below which lie one-quarter of the data items. The upper quartile ( Q3 ) is the value above which lie one-quarter of the data items. The median divides the data series into two parts, an upper
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This note was uploaded on 07/12/2011 for the course MATH 241 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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04Cumulative Frequency Tables and Graphs - CUMULATIVE...

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