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3 years ago

1 point

Mathematics

1 answer:

wariber [46]3 years ago

8 0

Answer:

x + 13 < 50

Step-by-step explanation:

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The average heights of a random sample of 400 people from a city is 1.75 m. It is known that the heights of the population are r

Dimas [21]

Answer:

The 95% confidence interval for the average heights of the population is between 1.7108m and 1.7892m.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, find M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

The standard deviation is the square root of the variance. So

$\sigma = \sqrt{0.16} = 0.4$

Then

$M = 1.96*\frac{0.4}{\sqrt{400}} = 0.0392$

The lower end of the interval is the mean subtracted by M. So it is 1.75 - 0.0392 = 1.7108m

The upper end of the interval is the mean added to M. So it is 1.75 + 0.0392 = 1.7892m

The 95% confidence interval for the average heights of the population is between 1.7108m and 1.7892m.

4 0

3 years ago

Help please. I'm stuck.

sweet-ann [11.9K]

Answer:

Step-by-step explanation:

Each bracelet takes 28+10 = 38 elastic bands. If you have 600 bands, you can make ...

600/38 = 15 30/38 . . . bracelets

You can make 15 complete bracelets.

You will have 30 elastic bands left over.

3 0

2 years ago

Ashley earns $5 per hour babysitting. How much will she earn in 3 hours?

fgiga [73]

Ashley will get $15 because it like 3X5=15

7 0

3 years ago

The population of a certain island has an annual growth rate of 6.9%. If you start with a poplulation of 2500 people, what would

masya89 [10]

1,725 is you answer because you growth rate is 172.5 a year x ten is 1725

3 0

3 years ago

a)Convert 7.5 cm into m b) convert 2 m into mm c) Convert 5 m into cm d) convert mg into 9 e)Convert 1.5 mg into kg f)convert 1

dem82 [27]

Answer:

0.075 metre

2000 mm

500 cm

0.001 gram

1.5 × 10-6 kilogram

86400 second

18000 second

Step-by-step explanation:

hope it helps

7 0

3 years ago