All categories

3 years ago

PLEASEEEEE HELP!!!! 15 POINTS AND DONT PUT SOMETHING RANDOM ITS DUE SOON!!

Mathematics

1 answer:

Pavlova-9 [17]3 years ago

7 0

Answer:

Step-by-step explanation:

45(123)

You might be interested in

The cost to rent a canoe for different periods of time is shown in the table below.

Alexeev081 [22]

So what is it about

6 0

3 years ago

I need b-d plz help........

almond37 [142]

Which one do u need me to help with

6 0

4 years ago

Determine the minimum sample size required when you want to be 99% confident that the sample mean is within 0.50 units of the po

vfiekz [6]

Answer:

b. 224

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:

$\alpha = \frac{1-0.99}{2} = 0.005$

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 $1-0.005 = 0.995$ , so $z = 2.58$

Now, find the margin of error 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.

In this problem:

We want to find n, when $M = 0.5, \sigma = 2.9$ So

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

$0.5 = 2.58*\frac{2.9}{\sqrt{n}}$

$0.5\sqrt{n} = 7.482$

$\sqrt{n} = 14.964$

$(\sqrt{n})^{2} = (14.964)^{2}$

$n = 223.9$

The nearest integer number to 223.9 is 224.

So the correct answer is:

b. 224

6 0

3 years ago

Please help me. God bless you all

Yakvenalex [24]

Answer:

x = 11, y=-½

Step-by-step explanation:

Simultaneous equations - subtract the first equation from the second.

x + 4y = 9

-(x - 2y = 12)

6y = -3

y = -½

Substitute y

x + 4(-½) = 9

x + -2 = 9

x = 11

5 0

4 years ago

Read 2 more answers

Which point lies on a circle with a radius of 5 units and center at P(6, 1)?

lions [1.4K]

<span>Well, there would be an infinite amount of points that lies on the circle but the general form of it would be:
(x-6)² + (y-1)² = 25</span>

7 0

4 years ago