Question
Following is the height of 10 students:
|
Students |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
|
Height (cm) |
155 |
153 |
168 |
160 |
162 |
166 |
164 |
180 |
157 |
165 |
Calculate arithmetic mean by using direct and short cut method.
Solution
(a) Calculation of arithmetic mean by direct method:
|
Students |
Height (c.m.) |
|
A B C D E F G H I J |
155 153 168 160 162 166 164 180 157 165 |
|
N= 10 |
Σ = 1630 |
(b) Calculation of arithmetic mean by indirect method :
|
Students |
Height (c.m.) |
d |
|
A B C D E F G H I J N= 10 |
155 153 168 160 162 166 164 180 157 165 |
-5 -7 + 8 + 0 + 2 + 6 + 4 + 20 -3 + 5 Σ d = 30 |
)
