Question

frequency
Table 14.2
55 - 70 | 70-85
85 - 100
Class interval
10-25 25-40 40-55
2
3
7
6
6
Number of students
6.​

Answer 1

Answer:

Explanation:

Class interval  Mean Class Interval Frequency   Deviation

10-25  17.5 2  -30  

25-40  32.5 3  -15  

40-55  47.5=A 7  0  

55-70  62.5 6  15  

70-85  77.5 6  30  

85-100  92.5 6  45  

Mean deviation =  

6

2×(−30)+3×(−15)+6×15+6×30+6×45

​  

 

=  

6

−60−45+90+180+270

​  

=72.5