Schedule mock interviews on the Meeting Board, join the latest community discussions in our Consulting Q&A and find like-minded Interview Partners to connect and practice with!
Back to overview

How many humans were born since beginning of humanity?

How would you solve this one?

2
6.7k
42
Be the first to answer!
Nobody has responded to this question yet.
Top answer
on Apr 18, 2016

One proposed approach

1. Define when the humanity began, how long ago. 

2. Divide the period between when the humanity began until today in more periods based on the total population, assuming each period had a constant total population. (here you should mainly pay attention to what happened after the middle ages, before that it doesn't really mater for the final result because the world total population was much much smaller than until the middle ages)

3. For each period determine the average life expectancy. 

4. Having the average life expectancy use the replacement principle to get how many people were born within that period.

5. Sum up results from every period. 

Any comment or another method is welcomed. ​

Stefan

2
on May 04, 2016

Great analysis! Except for one minor problem, I think the global population burst since the discovery of antibiotics, which is around 1940s. I assume the change after middle ages is not that substancial compared to what happened after 1940s.

0
Similar Questions
Consulting
McKinsey Case Interview
on Jul 27, 2024
Global
7
2.6k
Top answer by
Anonymous
39
7 Answers
2.6k Views
+4
Consulting
Revolut Problem Solving interview
on Jun 20, 2025
Global
5
100+
Top answer by
Alessa
Coach
xMcKinsey & Company | xBCG | xRB | >400 coachings | feel free to schedule an intro call for free
7
5 Answers
100+ Views
+2
Consulting
R2 Experience
on Jun 28, 2025
Global
8
100+
Top answer by
#1 Coach for Sessions (4.500+) | 1.500+ 5-Star Reviews | Proven Success: ➡ interviewoffers.com | Ex BCG | 10Y+ Coaching
6
8 Answers
100+ Views
+5