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MARKS : 100 - 150 ( 60 students), 150-200 ( 100 students), 200-300 ( 100 students), 300-500 ( 80 students), 500-800 ( 180 students). if a sudent is selected at random from a class, find the probability, that student is: (i) having marks less than 200 (ii) having marks between 150 and 300 (iii) having marks more than 150.

Asked by Vikas 3rd January 2015, 2:07 PM
Answered by Expert
Answer:

begin mathsize 14px style Marks space space space space space space space space space Number space of space students 100 minus 150 space space space space space space space space space 60 150 minus 200 space space space space space space space space 100 200 minus 300 space space space space space space space space 100 300 minus 500 space space space space space space space space space space 80 500 minus 800 space space space space space space space space 180 Total space space space space space space space space space space space space space space space space 520  left parenthesis straight i right parenthesis space No. space of space students space having space less space than space 200 space marks space equals space 60 space plus space 100 space equals space 160 Thus comma space straight P left parenthesis student space having space less space than space 200 space marks right parenthesis equals 160 over 520 equals 4 over 13  left parenthesis ii right parenthesis space No. space of space students space having space marks space between space 150 space and space 300 space equals space 100 space plus space 100 space equals space 200 Thus comma space straight P left parenthesis student space having space marks space between space 150 space and space 200 right parenthesis equals 200 over 520 equals 5 over 13  left parenthesis iii right parenthesis space No. space of space students space having space marks space more space than space 150 space equals space 100 space plus space 100 space plus 80 plus 180 equals space 460 Thus comma space straight P left parenthesis student space having space marks space more space than space 150 right parenthesis equals 460 over 520 equals 23 over 26 end style

Answered by Expert 5th January 2016, 6:18 PM
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