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Measures of Central Tendency
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.
(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 |
Sponsor Area
The following series relates to the daily income of workers employed in a firm. Compute the (a) highest income of lowest 50% workers, (6) minimum income earned by the top 25% and (c) maximum income earned by lowest 25% workers.
|
Daily Income (in Rs.) |
Number of Workers |
|
10-14 15-19 20-24 25-29 30-34 35-39 |
5 10 15 20 10 5 |
The following table gives production yield in kg. per hectare of wheat of 150 arms in a village. Calculate the mean, median and mode production yield.
|
Production yield (kg. per hectare) |
50-53 |
53-56 |
56-59 |
59-62 |
62-65 |
65-68 |
68-71 |
71-74 |
74-77 |
|
Number of farms |
3 |
8 |
14 |
30 |
36 |
28 |
16 |
10 |
5 |
The size of land holdings of 380 families in a village is given below. Find the median size of land holdings.
|
Size of Land Holdings (in acres) |
Number of families |
|
less than 100 100-200 200-300 300-400 400 and above |
40 89 148 64 39 |
What do you mean by 'Average'?
Pocket expenditures of 6 students are (Rs.) 6,12,18,24,30 and 36 respectively. Find out arithmetic mean.
Name various kinds of statistical averages?
Give formula of weighted averages.
Give formula of calculating arithmetic average of a continuous series.
What is arithmetic mean?
Define median.
Sponsor Area
Sponsor Area
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