الأجوبة
It appears that the mean value will lie the class 131-140.
The mid value (for class mark) of this interval is 135.5.
Take a = 135.5, the width of each interval is c = 10.
|
Height (cm) |
Mid-class (x_i) |
Frequency (f) |
x_i f_i |
u=(x-135.5)/10 |
u f |
|
101-110 |
105.5 |
8 |
844 |
-3 |
-24 |
|
111-120 |
115.5 |
15 |
1732.5 |
-2 |
-30 |
|
121-130 |
125.5 |
24 |
3012 |
-1 |
-24 |
|
131-140 |
135.5 |
40 |
5420 |
0 |
0 |
|
141-150 |
145.5 |
10 |
1455 |
1 |
10 |
|
151-160 |
155.5 |
3 |
466.5 |
2 |
6 |
|
Total |
|
N =100 |
∑〖x_i f_i=12930〗 |
- |
∑〖u f= -62〗 |
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