1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
poizon [28]
4 years ago
11

Kiera wanted to find the approximate number of history books at the Library she works at she used the computer to randomly take

a sample 80 books and found 6 of them were considered history books. There are 21,360 books at this library. What is the best estimate of the amount of history books at this library
Mathematics
1 answer:
Goshia [24]4 years ago
8 0
7rxrrdridurudrskuzrYe
You might be interested in
An airplane makes an angle of depression of 23.2° when it descends. It is calculated that the
dem82 [27]

Answer:

im bord so dont delete this

Step-by-step explanation:

4 0
3 years ago
Last year a state university received 3,560 applications from boys,of those applications,35%were from boys who lived in other st
Aleksandr [31]
\frac{3560}{x} = \frac{40}{100}40x=356000 x= 8900 applications 

you make x the number of total applications   
3 0
4 years ago
6m + 2 - 4m =<br><br><br>help with this please ​
devlian [24]

The answer is: 2(m+1)


First combine like terms.
<em>we do 6m-4m which is 2m</em>
2m+2=?

Second we factor. We notice that both terms have 2.
2(m+1)

<em>by distributive law, the 2 is distributed to m and 1.
</em>

8 0
2 years ago
Points M, N, D, and E are on a circle with center K. Also, ED is a diameter of the circle
Anestetic [448]

Answer:

Step-by-step explanation:

Kn

3 0
3 years ago
NarStor, a computer disk drive manufacturer, claims that the median time until failure for their hard drives is more than 14,400
Ne4ueva [31]

Answer:

The test statistics is  t  =  -1.727

Step-by-step explanation:

From the question we are told that

The data given is  

   330 620 1870 2410 4620 6396 7822 81028309 12882 14419 16092 18384 20916 23812 25814

 The population mean is  \mu  =  14400

    The  sample  size is  n =  16

  The  null hypothesis is  \mu \le  14400

    The  alternative hypothesis is  H_a  :  \mu > 14400

The sample mean is mathematically evaluated as

  \= x  =  \frac{\sum x_i}{n}

So

   \= x  =  \frac{330+ 620+ 1870 +2410+ 4620+ 6396+ 7822+ 8102+8309+ 12882+ 14419+ 16092+ 18384 +20916+ 23812+ 25814 }{16}

=>  \= x = 10799.9

The  standard deviation is mathematically represented as

      \sigma =\sqrt{\frac{ \sum (x_i - \=x)^2}{n}}

So

\sigma =\sqrt{\frac{(330- 10799.9)^2 + (620- 10799.9)^2+ (1870- 10799.9)^2 +(2410- 10799.9)^2 + (4620- 10799.9)^2 +(6396- 10799.9)^2 +(7822- 10799.9)^2 }{16}}  \ ..

   ..\sqrt{ \frac{(8102 - 10799.9)^2 +(8309 - 10799.9)^2 + (12882 - 10799.9)^2 + (14419 - 10799.9)^2 + (16092 - 10799.9)^2 + (18384 - 10799.9)^2 +(20916 - 10799.9)^2  }{16}} \ ...

  \ ... \sqrt{\frac{(23812 - 10799.9)^2 +(25814 - 10799.9)^2 }{16}}

=>  \sigma  =  8340

  Generally the test statistic is mathematically represented as

  t =  \frac{10799.9- 14400}{ \frac{8340}{\sqrt{16} } }

t  =  -1.727

From the z-table  the p-value is  

     p-value  = P(Z > t) =  P(Z >  -1.727) =  0.95792

 From the values obtained we see that

        p-value  >  \alpha  so we fail to reject the null hypothesis

Which implies that the claim of the NarStor is wrong

5 0
3 years ago
Other questions:
  • You are paid $8.35/hr at your part time job. your deductions are FICA (7.65%), Federal tax withholding (9.15%), &amp; state tax
    7·1 answer
  • A cylindrical swimming pool has a diameter of 16 feet and a height of 4 feet. About how many gallons of water can the pool conta
    7·1 answer
  • Use property to find sum pr product 5 x 23 x 2
    7·2 answers
  • 3x^2 Type of expression coefficients and constant
    8·1 answer
  • Boris wants to buy pineapples and watermelons. He wants to buy a total of at least 161616 fruits (condition AAA) with \$60$60dol
    12·1 answer
  • (b) Suppose you pay the loan off after 2 years. How much interest do you save by paying the loan off
    15·1 answer
  • Sam tried to subtract 21.3-1.9
    5·2 answers
  • You can open the picture and help me and ty if you are
    10·1 answer
  • You have 8 shirts and 5 pairs of pants. How many outfits are there?
    14·1 answer
  • You are driving on a freeway with a posted speed of 65 mph. Nearly all of the cars are traveling between 35 and 40 mph. What wou
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!