Question

Of the three variables required to estimate population size (M, S, and R), which variable should you put the most energy and funding into? In other words, which one is the most important to getting an accurate estimate of population size?

Answer 1

M denotes mean arithmetic mean which focus on the average computed from the average population .
And second on S means standard deviation or standard error of mean which is deviation of each variable in the population. Which given the variability factors in the population.
Last one R it means Range means population density describes which the size in a specific area.
As per three variable range is the most importent one to getting an accurate estimate of population size.