if a teacher want to analyse the performance of two sections of students in a mathmetic test of 80 marks.looking at their performances, she found that few students got under 20 marks and a few got 70 and above. marks-0-10,10-20,20-30,30-40,40-50,50-60,60-70,70-80 students -2,6,10,20,24,12,11,5. a)the class interval with lowest frequency is______. b)what is the width or size of the class? c)what is the upper limit of the class interval 50-60? d)how many students have mark less than 50? e)how many students have mark more than 50?
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gjfi if you teacher what analyse the performance of to section of students in mathematics test of
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Step-by-step explanation:
Totalnumber of students = 90i Number of students getting less than 20 % marks in the test = 7Hence required probability P = 7/90ii Number of students obtaining marks 60 or above = 15 + 8 = 23Hence required probability P = 23/90
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