omeone help me with this question? In a certain country, a population census was carried out in 1990 and its population turned out to be 8 million inhabitants, then another census was carried out in 2015 and its population turned out to be 14 million inhabitants. Use the population model of Malthus, to obtain the population in millions of inhabitants of the country, in the year 206

omeone help me with this question? In a certain country, a population census was carried out in 1990 and its population turned out to be 8 million inhabitants, then another census was carried out in 2015 and its population turned out to be 14 million inhabitants. Use the population model of Malthus, to obtain the population in millions of inhabitants of the country, in the year 206

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

See similar textbooks

Similar questions

Please help me
Terrariums are self-contained ecosystems inside a closed container. A local farmer produces terrariums for sale, but must wait for the plants in the terrarium to grow before she can sell them. On average, her terrariums take 24 days before they are ready to sell. She experiments with a new soil mixture, aiming to decrease the time it takes for the terrariums to be ready. In a sample of 7 terrariums with the new soil mixture, the farmer finds that the average time before they are ready is 20 days with a standard deviation of 3 days. In testing the hypotheses H_0 :μ=24 and Ha:μ<24, what is the value of the t-test statistic? Round your answer to three decimal places. Please show work!!!
The Bulldog Electronics Company is currently producing a submarine detector for the Navy. The detector will be powered by one of three uranium fuel cells. The fuel cells are activated sequentially, as needed. The procedure is the following. When the detector is installed at the bottom of the ocean, one fuel cell is activated. When that fuel cell stops working, a second cell is automatically activated. When it stops working, the third cell is automatically activated. The time to failure of each cell has a normal distribution with a mean of 400~hours and a standard deviation of 100~hours. Also, the time to failure of an individual cell is independent of the time to failure of any other cell. 1.iWhat is the probability a cell lasts between 300~hours and 700~hours? Some Work 0.14 0.16 0.50 0.84 0.86 Other _____ Powered by Qualtrics
Terrariums are self-contained ecosystems inside a closed container. A local farmer produces terrariums for sale, but must wait for the plants in the terrarium to grow before she can sell them. On average, her terrariums take 30 days before they are ready to sell. She experiments with a new soil mixture, aiming to decrease the time it takes for the terrariums to be ready. In a sample of 12 terrariums with the new soil mixture, the farmer finds that the average time before they are ready is 21 days with a standard deviation of 3 days. in testing the hypotheses H0:μ= 30 and Ha:μ< 30, what is the value of the tt-test statistic? Round your answer to three decimal places.
Sarah believes that completely cutting caffeine out of a person’s diet will allow him or her more restful sleep at night. In fact, she believes that, on average, adults will have more than two additional nights of restful sleep in a four-week period after removing caffeine from their diets. She randomly selects 88 adults to help her test this theory. Each person is asked to consume two caffeinated beverages per day for 2828 days, and then cut back to no caffeinated beverages for the following 2828 days. During each period, the participants record the numbers of nights of restful sleep that they had. The following table gives the results of the study. Test Sarah’s claim at the 0.020.02 level of significance assuming that the population distribution of the paired differences is approximately normal. Let the period before removing caffeine be Population 1 and let the period after removing caffeine be Population 2. Numbers of Nights of Restful Sleep in a Four-Week Period With Caffeine…
Assume you are leading an initiative to improve infrastructure. Every year, 20% of roads in good conditions deteriorate into bad conditions, while current spending fixes 30% of roads in bad condition, turning them to a good condition. In the long run how many roads will be in good condition?
Watching all these drones buzz back and forth is giving you eyestrain. But you can’t just count every single drone - how could you ever know that you had caught them all? You instead take the following approach: you build a taser-net that you can use to stun and catch drones (much more fun than just watching), before tagging them and re-releasing them into the wild. Working for a week, you manage to tag 400 drones, releasing them back into the wild. After waiting a week, you start catching drones again. Catching another 400 drones, you find that 270 of the drones you’ve caught are tagged, meaning you’d caught them before. 130 of your new catch are untagged, meaning this is the first time that you’ve caught them. Assume drones were equally likely to be caught at all times. Before catching the second batch of drones, there were 400 tagged drones in the wild, the rest were untagged. 1) After catching the second batch of drones, what is the smallest number of drones N that might be in the…
Our family brought lots of hot dogs along on our latest camping trip. However, after setting up the tent, we didn’t take care to make sure that the food was safe – and raccoons ate 1/3 of the hot dogs! Grumbling, we cleaned up the mess, then ate 6 hot dogs for lunch. But we forgot to put the rest away when we went hiking, and lost 1/4 of our dwindling supply to jays! Just as a precaution, Mom went to the store and bought enough hot dogs to increase our supply by 2/3. Our campsite neighbors, however, ran out of food, so we gave them 2/9 of our remaining hot dogs and then ate 11 hot dogs for our dinner. That night, bears got 3/4 of the last part of our supply, and in the morning there were only 6 hot dogs left! How many hot dogs did we start with? (Next time maybe we should just bring granola bars...)
The population dynamics of many fish are characterized by extremely high fertility rates among adults and very low survival rates among the young. A mature halibut may lay as many as 2.5 million eggs, but only 0.00035% of the offspring survive to the age of 3 years. Use scientific form to approximate the number of offspring that live to age 3.
A research study in a big metropolitan area shows that 2% of individuals living within the city limits move to suburbs during one-year period while 1% of individuals living in the suburbs move to the city during a one-year period. 1. A group of 100 individuals are now living in the city, how many of them will stay after 3 years.
The amount of contaminants that are allowed in food products is determined by the FDA (Food and Drug Administration). Common contaminants in cow milk include feces, blood, hormones, and antibiotics. Suppose you work for the FDA and are told that the current amount of somatic cells (common name "pus") in 1 cc of cow milk is currently 750,000 (note: this is the actual allowed amount in the US!). You are also told the standard deviation is 62000 cells. The FDA then tasks you with checking to see if this is accurate. You collect a random sample of 45 specimens (1 cc each) which results in a sample mean of 762004 pus cells. Use this sample data to create a sampling distribution. Assume that the population mean is equal to the FDA's legal limit and see what the probability is for getting your random sample. a. Why is the sampling distribution approximately normal? b. What is the mean of the sampling distribution? c. What is the standard deviation of the sampling distribution? d. Assuming…
not A 1995 study by the School of Public Health reported that 87% of male students who live in a fraterity house are binge drinkers. The figure for fraternity members who are residents of a fraternity house is 71 %, while the figure for men who do not belong to a fraternity is 44 % Suppose that 11% of U.S. male students live in a fraternity house, 15% belong to a fraterity but do not live in a fraterity house, and 74% do not belong to a fraterity a. What is the probability that a randomly selected malp student is a binge drinker? b. If a randomly selected male student is a binge drinker, what is the probability that he lives in a fraterity house? The probability that a randomly selected male student is a binge drinker is 0.5509 (Type an integer or a decimal rounded to two decimal places as needed) CETTE