This is about the first unit of statistics "the normal probability curve", Lecture notes of Descriptive statistics

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THE NORMAL CURVE i very large number of students 0 uprdocording tb their heights with studen behind one another. At the middle of the height stand, the files extend to ‘the Tear, small and the tall students stand the files some of the students may have noone be from helicopter immediately above the ass, as in a figure 1. f college, assembled and lined t of the same height standing tow where stude. while near the row where the are short. At the extreme ends hind them. The view of the files embly of students would appear nt of average Fig. 1 The diagrammatic representation of frequency distribution on aan. physical, biological and psychological measurements are observe ° approximated closely to this bell shaped form. The measures ar concentrated closely round the centre and tapper off from the highest point equally to right and left. To measure such distributions of biological and paychelseice. characteristics of individuals, some reference curve which ay a" . urely a8 a unit of measurement of such distributions was require teal cate Mathematical curve was obtained for this purpose. This rohit eite may which was ideal in nature was known as Normal pa is generally define Probabilities of their respective events and therefore, termed as Normal Probability curve. i asure their When we select people from the general Bae cn gnt Aatilileence, Physical or psychological traits such as height, ae