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3 years ago

Have no idea how to answer this, please help :(

Mathematics

1 answer:

Juli2301 [7.4K]3 years ago

5 0

Answer:

Step-by-step explanation:

a) perimeter = 8x + 3 + 5 + 7x + 4

b) perimeter = 15x + 12

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4 years ago

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In 2012, the population of New Zealand was approximately 4.43

mrs_skeptik [129]

Answer: 6.71 × 10^6 people

Step-by-step explanation:

Given that the population of New Zealand was approximately 4.43million people. In the same year, the population of Belgium was approximately 11.14 million people.

The difference in number of population will be

(11.14 - 4.43) millions

= 6.71 millions people

Expressing the answer by using scientific notation will be

6.71 × 10^6 people.

Therefore, 6.71 × 10^6 people live in Belgium than in New Zealand

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3 years ago

6. Spiderman is three times as old as Superman.

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What's <br> 9 + (28 − 2) ÷ 0.2

tekilochka [14]

Answer:i think is ((((139)))))

Step-by-step explanation:

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3 years ago

A study was conducted to investigate the relationship between maternal smoking during pregnancy and the presence of congenital m

Pachacha [2.7K]

Answer:

a) In the explanation.

b) P=0.09714

c) P=0.0866

d) p=0.208

Step-by-step explanation:

a) The sampling distribution will have this properties:

1 - The sampling distribution of a proportion is equal to the binomial distribution.

2 - The mean of the sampling distribution will be equal to the proportion of the population (0.328).

$\mu=\pi=0.328$

3 - The standard deviation will be equal to the square root of the product of the proportion and its complementary, divided by the sample size.

$\sigma_s=\sqrt{\pi(1-\pi)/n}=\sqrt{0.328*(1-0.328)/25}=0.094$

B) The fraction with sample proportion of 0.45 or higher is

$z=(p-\pi)/\sigma=(0.45-0.328)/0.094=1.298\\\\P(p\geq0.45)=P(z\geq 1.298)=0.09714$

C) The fraction with sample proportion of 0.20 or lower is

$z=(p-\pi)/\sigma=(0.2-0.328)/0.094=-1.362\\\\P(p\leq0.2)=P(z\geq -1.362)=0.0866$

D) The value of p that cuts off the lower 10% of the distribution corresponds to z=-1.28.

Then we have

$z=(p-\pi)/\sigma\\\\p=\pi+z\sigma=0.328+(-1.28)*0.094=0.328-0.120=0.208$

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3 years ago