in a class test ,marks obtained by 120 students are given in the following frequency distribution the mean is 69 - Maths - Statistics

Question

in a class test ,marks obtained by 120 students are given in the
following frequency distribution the mean is 69 find x and y?
C I?F I?
0-10 1?
10-20 3?
20-30 7?
30-40 10?
40-50 15?
50-60 X?
60-70 9?
70-80 27?
80-90 18?
90-100 Y

Akshita Goyal · Accepted Answer

in a class test ,marks obtained by 120 students are given in the following frequency distribution the mean is 69 find x and y? C.I?F.I? 0-10 1? 10-20 3? 20-30 7? 30-40 10? 40-50 15? 50-60 X? 60-70 9? 70-80 27? 80-90 18? 90-100 Y

in a class test ,marks obtained by 120 students are given in the following frequency distribution the mean is 69 find x and y?
C.I?F.I?
0-10 1?
10-20 3?
20-30 7?
30-40 10?
40-50 15?
50-60 X?
60-70 9?
70-80 27?
80-90 18?
90-100 Y