Register to reply

Estimate the number of fish

by Alexsandro
Tags: estimate, fish, number
Share this thread:
Aug28-05, 01:37 PM
P: 51
Researchers of a department of engineering of fish are studying the fish of a lake. In the first phase of the work they collect 100 fish, place labels in all they and they return them to the lake. One week later them they come back to the lake, they collect more 100 fish and they observe that 7 of them possess labels.

(a) Which the best estimate for the number of fish in the lake?

(b) That assumptions must be satisfied to justify the estimate of the previous item ?
Phys.Org News Partner Science news on
Mysterious source of ozone-depleting chemical baffles NASA
Water leads to chemical that gunks up biofuels production
How lizards regenerate their tails: Researchers discover genetic 'recipe'
Aug28-05, 06:00 PM
Sci Advisor
P: 6,058
(a) N=100(100/7)=1428

(b) Extrapolation - since 7/100 of the caught fish were tagged, assume that 7/100 times (N) total number of fish = total number of that have been tagged (=100).

Register to reply

Related Discussions
Fish in a Fish bowl? Advanced Physics Homework 1
What level of precision is implied in a order-of-magnitude calculation Introductory Physics Homework 2
Condition number (or estimate) of a very large matrix Linear & Abstract Algebra 0
Estimate the number of red fishes in the pond Set Theory, Logic, Probability, Statistics 1
Big fish small fish General Discussion 14