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lapo4ka [179]
2 years ago
10

A 4-column table with 5 rows. Column 1 is labeled Variable with entries Total Population, Population 65 +, Population less than

15, Life expectancy at birth, Population projection 2050. Column 2 is labeled Africa with entries 967,049,000, 32,653,000 (3 percent), 400,004,000 (41 percent), 54 years, 1,932,394,000. Column 3 is labeled Asia with entries 4,052,332,000, 268,981,000 (7 percent), 1,090,690,000 (27 percent), 69 years, 5,427,360,000. Column 4 is labeled Europe with entries 735,579,000, 118,577,000 (16 percent), 114,649,000 (16 percent) 75 years, 685,007,000. Data from the P B R World Population Data Sheet.
Look at the data above. Provide an explanation for Europe’s projected population decrease by the year 2050.
Mathematics
2 answers:
SCORPION-xisa [38]2 years ago
8 0

Answer:

Europe is a continent that for some time now has had a problem with its population. The reason for it is that Europe's birthrates have been very low, not enough even for just maintaining the same number of population, as the birthrates are below 2 children per wife all countries apart from three.

The only three countries where the average is more than 2 children per women are Ireland, Albania, and Kosovo, all of which are small countries with small populations.

Also the life expectancy in Europe is relatively high, so the older population is constantly increasing, thus resulting in an aging population.

Of course the elderly people will eventually pass away, and with the smaller and smaller number of youngsters and very low birthrates the continent will constantly lose more and more population.

Vaselesa [24]2 years ago
7 0

Answer:

The percentage of people over the age of 65 and under the age of 15 in Europe is currently the same at 16% each. Therefore, the majority of the population is between the ages of 16 and 64. In forty years from now, in 2050, a greater percentage of the population will be over the age of 65. Europe also has a relatively long life expectancy of 75 years. This, combined with a low birth rate means that by 2050 Europe’s population will actually be less than it is today.

Step-by-step explanation:

Possible answer Edge 2020

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Step-by-step explanation:

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Each day Julian gives his dog, Banjo, 3 liters of water and 500 grams of food. Julian wants to track the total amount of the foo
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The correct answer would be option C.

Step-by-step explanation:

Since he gives the dog 3 liters of water and 500 grams of food a day we know that on the fifth day the dog will have gotten 15 liters of water and 2,500 grams of food.

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Traffic speed: The mean speed for a sample of cars at a certain intersection was kilometers per hour with a standard deviation o
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Answer:

Step-by-step explanation:

Hello!

X₁: speed of a motorcycle at a certain intersection.

n₁= 135

X[bar]₁= 33.99 km/h

S₁= 4.02 km/h

X₂: speed of a car at a certain intersection.

n₂= 42 cars

X[bar]₂= 26.56 km/h

S₂= 2.45 km/h

Assuming

X₁~N(μ₁; σ₁²)

X₂~N(μ₂; σ₂²)

and σ₁² = σ₂²

<em>A 90% confidence interval for the difference between the mean speeds, in kilometers per hour, of motorcycles and cars at this intersection is ________.</em>

The parameter of interest is μ₁-μ₂

(X[bar]₁-X[bar]₂)±t_{n_1+n_2-2} * Sa\sqrt{\frac{1}{n_1} +\frac{1}{n_2} }

t_{n_1+n_2-2;1-\alpha /2}= t_{175; 0.95}= 1.654

Sa= \sqrt{\frac{(n_1-1)S_1^2+(n_2-1)S_2^2}{n_1+n_2-2} } = \sqrt{\frac{134*16.1604+41*6.0025}{135+42-2} } = 3.71

[(33.99-26.56) ± 1.654 *(3.71*\sqrt{\frac{1}{135} +\frac{1}{42} })]

[6.345; 8.514]= [6.35; 8.51]km/h

<em>Construct the 98% confidence interval for the difference μ₁-μ₂ when X[bar]₁= 475.12, S₁= 43.48, X[bar]₂= 321.34, S₂= 21.60, n₁= 12, n₂= 15</em>

t_{n_1+n_2-2;1-\alpha /2}= t_{25; 0.99}= 2.485

Sa= \sqrt{\frac{(n_1-1)S_1^2+(n_2-1)S_2^2}{n_1+n_2-2} } = \sqrt{\frac{11*(43.48)^2+14*(21.60)^2}{12+15-2} } = 33.06

[(475.12-321.34) ± 2.485 *(33.06*\sqrt{\frac{1}{12} +\frac{1}{15} })]

[121.96; 185.60]

I hope this helps!

3 0
2 years ago
Gavin likes biking. He never misses a chance to go for a ride when the weather is nice. This week his goal is to bike about 65 t
andreyandreev [35.5K]

Answer:

How far should he ride on each of the four days to reach his goal?

1st day: 8 miles

2nd day: 12 miles

3rd day: 18 miles

4th day: 27 miles

Step-by-step explanation: As the problem says, x is the number of miles he rides on the first day. Let's start off with that.

1st day: x miles

He want to ride 1.5 times as far as he rode the day before... no 1.5 more, but 1.5 <em>times</em> as far as he rode the day before; you would multiply 1.5 with the previous day's length.

2nd day: 1.5x

Then you multiply 1.5 to 1.5x to get the third day's.

3rd day: 2.25x

4th day: 3.375x

----------------------------

Phew! Gavin wants to ride a total of 65 miles over these four days, so if Gavin added all the miles of the four days, he should get 65...

1st+2nd+3rd+4th=65

x+1.5x+2.25x+3.375x=65

8.125x=65

\frac{8.125x}{8.125}=\frac{65}{8.125}

x=8

Yes! Now that we've got the hard part done... substitute 8 for ever single x.

1st day: 8 miles

2nd day: 1.5(8)=12 miles

3rd day: 2.25(8)=18 miles

4th day: 3.375(8)=27 miles

-------------------------

Checking my answer:

Just add the miles!

8+12+18+27=65

65=65

✓

-----------------------

Hope that helps! :D



5 0
2 years ago
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