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3 years ago

What is a rational number

Mathematics

1 answer:

siniylev [52]3 years ago

7 0

It's a number that can be expressed as a fraction, the numerator and the denominator of which, are integers.

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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

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

7 0

3 years ago

*EXTRA PTS* pls answer all 3 :)

dezoksy [38]

Answer:

5, x = 0, y = -2

6, x = 4, Y = 9

7, X = -2, Y = -2

Step-by-step explanation:

8 0

3 years ago

Find the percentage profit when a car was bought for 60,000k and sold for 140,000k.

Reil [10]

Step-by-step explanation:

profit = sold price - bought price

= 140,000 - 60,000 k

= 80,000 k

% profit = (80,000/60,000)×100

= 133.33 %

8 0

3 years ago

How do you draw 68 degrees on a protractor but without a protractor?

postnew [5]

If you are talking about a paper protractor you would put a line on 0 degrees and a line on 68 degrees. Same as a real one.

6 0

3 years ago

Read 2 more answers

If r = 6 units and x = 8 units, then what is the total surface area of the cylinder shown above?

Solnce55 [7]

I hope this helps you

Surface Area=2.pi.6.8

Surface Area=96pi

6 0

4 years ago