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3 years ago

Joseph chooses a book at random, looks at it,

Mathematics

2 answers:

makkiz [27]3 years ago

6 0

Answer:

he hates animals and cooking

Step-by-step explanation:

Romashka [77]3 years ago

3 0

Answer:

1/2

Step-by-step explanation:

if he only picked 2 books about cooking and animals that will be the denominator and 1 will be the numerator because he pick 1 of those books of the 2

You might be interested in

What is 0.33% in a fraction or mixed number in simplest form?

Kay [80]

0.33%

= 0.33/100

= (33/100) / 100

= 33/(100*100)

= 33 / 10000 In its simplest form.

3 0

3 years ago

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A city has 20 radio stations including 5 college stations. What is the probablility that a randomly chosen radio station in this

densk [106]

Answer:

1/4

Step-by-step explanation:

Probability calculates the likelihood of an event occurring. The likelihood of the event occurring lies between 0 and 1. It is zero if the event does not occur and 1 if the event occurs.

For example, the probability that it would rain on Friday is between o and 1. If it rains, a value of one is attached to the event. If it doesn't a value of zero is attached to the event.

the probability that a randomly chosen radio station in this city is a college radio station = number of college stations / total number of city radio stations

= 5/20

To transform to the simplest form. divide both the numerator and the denominator by 5

= 1/4

5 0

3 years ago

How are the expressions 8-15 and 8+(-15) different

Anna007 [38]

I don't think there is any difference, because 8-15=-7, and 8+(-15)=-7, because if you remove the parentheses, you will also get 8-15.

Please mark brainiest! Will really really appreciate it!

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4 years ago

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Savings accounts are never guaranteed by a government agency.<br> O True<br> O False

sveticcg [70]

True because the government doesn’t fall under financial institutions it only invests for its citizens

3 0

4 years ago

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The head librarian at the Library of Congress has asked her assistant for an interval estimate of the mean number of books check

Verdich [7]

Answer:

$n=(\frac{1.960(150)}{90})^2 =10.67 \approx 11$

So the answer for this case would be n=11 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma =150$ represent the population standard deviation

n represent the sample size

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The confidence interval for this case is given by: (740, 920)

We can find the estimate for the mean and we got:

$\bar X = \frac{740+920}{2} = 830$

and the margin of error is given by :

$ME = \frac{920-740}{2}= 90$

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{s}{\sqrt{n}}$ (a)

And on this case we have that ME =90 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} s}{ME})^2$ (b)

The critical value for 95% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.025;0;1)", and we got $z_{\alpha/2}=1.960$ , replacing into formula (b) we got:

$n=(\frac{1.960(150)}{90})^2 =10.67 \approx 11$

So the answer for this case would be n=11 rounded up to the nearest integer

5 0

3 years ago