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
taurus [48]
3 years ago
5

PLEASE HELP WILL GIVE BRAINLIEST AND 20 POINTS

Mathematics
1 answer:
Georgia [21]3 years ago
6 0
1250 lbs of sand.

So first let's find the volume of the sand in the sandbox. You have a square sandbox, with a side length of 5, meaning you have a length and width of 5. You also have half a foot of sand in the sandbox, meaning that you have a height of 0.5. To find the volume of the sand, multiply the length by the width by the height:

5 * 5 * .5 = 12.5

So you have 12.5 cubic feet of sand. If each cubic foot of sand is 100 lbs, then you just multiply the two:

12.5 * 100 = 1250.0


You might be interested in
in a random sample of 200 people, 154 said that they watched educational television. fine the 90% confidence interval of the tru
melisa1 [442]

Answer:

[0.7210,0.8189] = [72.10%, 81.89%]

Step-by-step explanation:

The sample size is  

n = 200

the proportion is

p = 154/200 = 0.77

<em>Since both np ≥ 10 and n(1-p) ≥ 10 </em>

<em>We can approximate this discrete binomial distribution with the continuous Normal distribution. As the sample size is large enough, not applying the continuity correction factor makes no significant  difference. </em>

The approximation would be to a Normal curve with this parameters:

<em>Mean </em>

p = 0.77

<em>Standard deviation </em>

\bf s=\sqrt{\frac{p(1-p)}{n}}=\sqrt{\frac{0.77*0.23}{200}}=0.0298

The 90% confidence interval for the proportion would be then  

\bf  [0.77-z^*0.0298, 0.77+z^*0.0298]

where \bf z^* is the 10% critical value for the Normal N(0,1) distribution , this is a value such that the area under the N(0,1) curve outside the interval \bf [-z^*,z^*] is 10%=0.1

We can either use a table, a calculator or a spreadsheet to get this value.

In Excel or OpenOffice Calc we use the function

<em>NORMSINV(0.95) and we get a value of 1.645 </em>

The 90% confidence interval for the proportion is then

\bf  [0.77-1.645^*0.0298, 0.77+1.645^*0.0298]=[0.7210,0.8189]

This means there is a 90% probability that the proportion of people who watch educational television is between 72.10% and 81.89%

If the television company wanted to publicize the proportion of viewers, do you think it should use the 90% confidence interval?

Yes, I do.

5 0
3 years ago
Convert 2 5/6 to an improper fraction
bearhunter [10]
Multiply the denominator by the number in front of it and then add it to the numerator. (6•2=12+5=17). The denominator stays the same. Your answer is 17/6. Hope this helped!
3 0
3 years ago
Consider the system of equations, x - 2y = 8 and -2x+4y=-16.
sammy [17]

Answer:

y = x/2 - 4    slope-intercept form

y = x/2 + 4   slope-intercept form

NO SOLUTION.

The graph is a pair of parallel lines one line through point (0, -4) and the other through point (0, 4)

Step-by-step explanation:

x - 2y = 8 and -2x+4y=-16.

we can easily convert these to slope intercept form

x - 2y = 8

-2y = 8 - x

2y = x - 8

y = x/2 - 8/2

y = x/2 - 4    slope-intercept form

------------------------------

-2x + 4y = 16

4y = 2x + 16

y = 2x/4 + 16/4

y = x/2 + 4   slope-intercept form

We have 2 lines that are parallel because they have the same slope

6 0
3 years ago
Read 2 more answers
??????!!!!! Please help
nadya68 [22]
(x^2-5x-6)= (x+1)(x-6)

one of them has to be zero...

x=-1, x=6.

Hope this helps!
4 0
3 years ago
Which of the following sets of data does NOT represent a function?
yan [13]
Set B has 2 of the same Y values which makes it not a function.
6 0
2 years ago
Other questions:
  • 1. What digit is in the tenths place when 12.03 is<br> multiplied by .74?
    6·1 answer
  • 15 POINTS! PLEASE HELP!
    5·2 answers
  • How do you write 7,020,032 in expanded forms.
    7·1 answer
  • Carpenters use a tool called a speed square to help them mark right angles . A speed square is a right triangle
    15·1 answer
  • 6.
    5·2 answers
  • Help solve<br> 34 = 28 - 2/5X
    6·1 answer
  • Infiniti sells 8 different models of cars, with 5 different trim levels and 5 color choices. What is the total amount of options
    9·1 answer
  • 6.<br> Solve the equation *x + 3 ={x +3
    6·2 answers
  • Help please I will give brainliset
    15·1 answer
  • The coordinates of point F are (1, 0.5) and the coordinates of point G are (− 1, − 0.5).
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!