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Sum
Following table gives the age of husbands and wives
Age of wives (in years) 
Age of husbands (in years) 

2030 
3040 
4050 
5060 

1525 
5 
9 
3 
— 
2535 
— 
10 
25 
2 
3545 
— 
1 
12 
2 
4555 
— 
— 
4 
16 
5565 
— 
— 
— 
4 
Find:
(a)The marginal frequency distribution of the age of husbands.
(b)The conditional distribution of the age of husbands when the age of wives lies between 25  35
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Solution
Age of wives (in years) 
Age of husbands (in years) 


2030 
3040 
4050 
5060 
Total 

1525 
5 
9 
3 
— 
17 
2535 
— 
10 
25 
2 
37 
3545 
— 
1 
12 
2 
15 
4555 
— 
— 
4 
16 
20 
5565 
— 
— 
— 
4 
4 
Total 
5 
20 
44 
24 
93 
(a) The marginal frequency distribution of the age of husbands.
Age of husbands  2030  3040  4050  5060  Total 
Frequency  5  20  44  24  93 
(b) The conditional distribution of the age of husbands when the age of wives lies between 25  35.
Age of husbands  2030  3040  4050  5060  Total 
Frequency  ___  10  25  2  37 
Concept: Uses of Vital Statistics in Demography
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