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# CBSE Class 10 Answered

the marks obtained by 120 students in mathematics test is given in following distribution maks obtained 0-20
Asked by rekhasharma25204 | 06 May, 2020, 07:42: PM
Question: The marks obtained by 120 students in mathematics test is given in the following distribution:
 Marks obtained 0-20 20-40 40-60 60-80 80-100 Total No. of students 17 f1 32 f2 19 120
The number of students in the mark groups 20-40 and 60-80 are f1 and f2 respectively. Find f1 and f2 if the mean marks is 50.
Solution:
 Marks obtained xi fi fixi 0-20 10 17 170 20-40 30 f1 30f1 40-60 50 32 1600 60-80 70 f2 70f2 80-100 90 19 1710
Answered by Renu Varma | 09 May, 2020, 12:59: PM

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