24 Answered Questions for the topic Population

12/19/19

You are studying three populations of beetles...

Population A has 10 beetles, of which 1 is brown and 9 are red. Population B has 100 beetles, of which 10 are brown and 90 are red. Population C has 30 beetles; 3 of them are brown and 27 are red.... more

10/19/19

The world's population is currently 2. If the population doubles every 39 years, what will the population be 15000 years from now?

Hello all. I am writing a fantasy novel and need to calculate population growth for realism purposes. There was another person that asked a similar question on a smaller scale, so I was plugging in... more

08/23/19

What was happening in Philipsburg, Montana in 1876?

I'm struggling to find much information online about Philipsburg, Montana's population in 1876. Since I believe in 1876 mining was expected to ramp up in the area, the population may have been... more

04/15/18

in a county with a population of 7264 people with a loss annually of 1.2%, what will the population be in 40 years?

this is for figuring a population estimate

03/13/18

The population P (in thousands) of Pittsburgh, PA from 2000 to 2003 can be modeled by P=2430e^ -0.0029t where t represents the yr, with t=0 corresponds to 2000.

Question: According to the model, when will the population be approximately 2.3 million?   Answer: 19 years.   Can someone please explain/list the steps on how to find this answer? 

03/13/18

The population P (in thousands) of Pittsburgh, PA from 2000 to 2003 can be modeled by P=2430e^ -0.0029t where t represents the yr, with t=0 corresponds to 2000.

Question: What were the populations of PA in 2000 and 2003?   Answer: 2000: 2,430,000, 2003: 2,408,950   Can someone please explain/list to me the steps to finding these answers?

12/02/17

What is the yearly percent increase in bear population each year? How many years will it take for the bear population to grow to 8,792 bears?

The yearly bear population in Yosemite National Park starting in 2003 can be modeled by b(x) = 5173(1.039)x . What is the yearly percent increase in bear population each year? How many years will... more

09/02/17

calculus question

A population of grasshoppers quadruples in twenty days. Assuming exponential growth, if the present population is 40 million, what will it be in 50 days? Answer the question by first finding the... more

07/28/17

According to the world population....?

According to the US Census, the world population Upper P, in billions, was approximatelyUpper P=6.7 e^0.011 twhere t is in years since January 1, 2007. At what rate was the world’s population... more

07/19/17

name the population 45% of chicago residents surveyed, own their own vehicle

Name the population 45% of chicago residents surveyed, own their own vehicle

11/10/16

How do I predict the population growth in 2050 with this problem?

Starting from a 2013 population of 7.1 billion, use the current annual growth rate of the United States, which is about 0.70%, to (a) find the approximate doubling time (use the rule of 70)... more

08/31/16

Help with my dissertation

So I need to estimate the people who eats in a certain food court daily. I counted the number of seats which 200, but the problem is what is the probability that this 200 seats will be occupied.... more

04/09/16

Find the base, b, for the exponential equation of the form y=a x b^x that describes each situation.

The population of a town decreased by 2.5% each year. The variable y gives the population after x years. Find the base, b, for the exponential equation of the form y=a x b^x that describes the... more

04/08/16

If t is time in months, how long does it take for the hummingbird population to double?

The size of a population of hummingbirds over time can be modeled by the equation p=55(2)t/3. How can the constant 55 be interpreted? If t is time in months, how long does it take for the... more

04/04/16

If a species has a ? = .8, and has a current population size of 100, how many years will it take for the population size to drop below 50 individuals

If a species has a λ = .8, and has a current population size of 100, how many years will it take for the population size to drop below 50 individuals

03/29/16

Statistics question: When 435 college students were surveyed,120 said they visited Instagram today.

When 435 college students were surveyed,120 said they visited Instagram today. Find a point estimate for p, the population proportion of college students who did not visit Instagram... more

03/29/16

Statistics question: A random sample of 40 statistics students had an average test grade of 81.5

A random sample of 40 statistics students had an average test grade of 81.5 and a standard deviation of 10.2. Construct the confidence interval for the population mean, μ if c = 0.90.   The... more

01/19/16

What was the total income of everyone in the United States?

In 2003 the population of the Unites States was 291 million people. The per-capita income was $31,459. What was the total income of everyone in the United States? Express you answer in scientific... more

12/02/15

Short 3 part question

The population P of a city has been increasing at an annual rate of 2.3%. It's population was 150 million in 2008 and P is in millions. a. Use the pert general formula to create a specific formula... more

09/28/15

Help on Precalculus question!!

A population is 25,000 in year t = 0 and grows at a continuous rate of 7.5% per year. Find a formula for P(t), the population in year t

09/27/15

Word Problem help

A population is 25,000 in year t = 0 and grows at a continuous rate of 7.5% per year. Find a formula for P(t), the population in year t

04/07/15

I need help

The government of Mexico declared blue sharks an endangered species they put tags on 36 blue sharks and released them later the corral 130 blue sharks among those blue sharks 20 were tagged

07/23/14

Population growth rate

From 2010 to 2013, big ol Texas had a population growth rate of 5.18%, starting with a massive 25,145,561 earthlings! On the other hand, California had a population of 37,253,956 in 2010 and grew... more

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