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# Statistics

## on Mar 07, 2012

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A short presentation on statistics.

A short presentation on statistics.

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## StatisticsPresentation Transcript

• In all early civilizations, the first expression ofmathematical understanding appears in the formof counting systems. Numbers in very earlysocieties were typically represented by groups oflines, though later different numbers came to beassigned specific numeral names and symbols(as in India) or were designated by alphabeticletters (such as in Rome). Although today, wetake our decimal system for granted, not allancient civilizations based their numbers on aten-base system. In ancient Babylon, asexagesimal (base 60) system was in use.
• TypesHISTOGRAM Frequency PolygonFrequency Less than Ogive curve curve More than Ogive curve
• Simply click on the title to go to therespective slide.1. Histogram2. Frequency curve3. Method to find the mode4. Example for modeTo view the slide inSTANDARD orderclick here--
• Simply click on the title to go to therespective slide.1. Histogram2. Frequency curve3. Method to find the MODE4. Example for modeTo view the slide inSTANDARD orderclick here--
• What is a histogram?A histogram is a display ofstatistical information thatuses rectangles to show thefrequency of data items insuccessive numerical
• •Construct a frequency polygon table for the following data of weight ingrams, using equal class intervals.•Observations:45,55,30,80,75,85,40,60,65,40,60,75,70,60,70,85,85,80,35,45,40,40,60,60,55,45,30,80,85,75. Class interval Tally marks Frequency 30-40 ||| 3 40-50 |||| | 6 50-60 ||| 3 60-70 |||| | 6 70-80 |||| 5 80-90 |||| || 7 Total 30
• Histogram87654 Frequency3210 30 40 50 60 70 80 BACK
• Draw a frequency curve and a frequency polygonMarks Frequency0-10 510-20 1120-30 1930-40 2140-50 1650-60 1060-70 870-80 6
• FREQUENCY CURVE25 On X-axis20 1cm=50 marks On y-axis 1cm=5 students1510 FREQUENCY50 0 20 40 60 80 100
• Frequency Polygon25 Scale-20 On X-axis 1cm=20 students15 On Y-axis 1cm=5 marks1050 0 20 40 60 80 100 BACK
• 1. Plot the normal histogram2. Join the four vertices of the bar with highest frequency3. Draw lines to intersect each other4. Trace them to the base line5. This point is the median BACK
• Chest in cm No. of students68-74 575-81 3182-88 4089-95 2095-102 3103-109 1
• MODE frequency 84.54540353025201510 frequency 5 0