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Anastasy [175]
3 years ago
14

Math 8 Unit 8 lesson 1-5

Mathematics
1 answer:
patriot [66]3 years ago
8 0

Can you please comment the questions, we don't know what to do.

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Tell which is greater 11/15,74%
Mekhanik [1.2K]
74% is grater hope i helped
4 0
3 years ago
Read 2 more answers
Find the area of the polygon.
zalisa [80]

Answer:

A=128\ cm^2

Step-by-step explanation:

we know that

The area of the polygon is equal to the area of a square plus the area of four congruent triangles

so

A=b^2+4[\frac{1}{2}(b)(h)]

where

b=8\ cm\\h=4\ cm

substitute

A=8^2+4[\frac{1}{2}(8)(4)]

A=64+64=128\ cm^2

4 0
3 years ago
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
Is 2 thirds times 5 greater than or less than 5
vfiekz [6]
Less than 5 is your answer
8 0
3 years ago
Read 2 more answers
a washer and a dryer cosr $873 combined. thenwasher cost$ $77 less than the dryer . what is the cost of the dryer.
Hitman42 [59]

Let the dryer cost x.

Then, the washer costs (x-77)

Together, they cost  (x) + (x-77) = 873

        2x-77 = 873      [subtract 77 from both sides]

           2x =    796      

            x = 398

So the dryer costs $398

5 0
3 years ago
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