Why are more babies born some years than others?

Probability Level 2

Drawing from the data provided in the Indian census of 2011 , the following is a bar chart of age against population size:

What is the reason for some of the really long bars?

Details and assumptions

If you are interested in population statistics, you might want to look at Estimating the Number of Indian Teenagers .

It's lucky to be born in certain years. Statisticians made up their data. Ages were rounded to a nice number. Everyone lies in surveys.

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Arron Kau by Arron Kau

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2 solutions

Shamik Banerjee
Jan 29, 2014

That's the most pragmatic inference !!! All the others do not hold good. :-)

9 Helpful 0 Interesting 0 Brilliant 0 Confused

If we observe the positions of the really long bars, we see that they are at approximately multiples of five, i.e. every five years. It's not such a stretch then to assume that people, when asked for their age, reply: "Oh, I'm fifty" when they're actually 49 or 51 years old.

Raj Magesh - 7 years, 4 months ago

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well! your 's is the most efficient method

Mayank Holmes - 7 years, 1 month ago

man this is no question at all !

Archiet Dev - 7 years, 3 months ago
Aditya Deodhar
Feb 20, 2014

Two reasons why this is the correct answer: 1. This is the most sensible option 2. The spikes occur at intervals of 5. Which means that people report their age rounded of to nearby multiples of 5 like 45 or 60. Hence the spikes.

0 Helpful 0 Interesting 0 Brilliant 0 Confused

I dont understand how is this question related to this topic?

Junyi Qian - 7 years, 3 months ago

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