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Ber [7]
3 years ago
5

HELP

Mathematics
2 answers:
mr Goodwill [35]3 years ago
8 0
The answer is b fyhsgdgdhhdbdhdvbdbdbbrhdhdh
Serjik [45]3 years ago
4 0

Answer:

A: 5+7+2.5=14.5/3=4.8333333

B: 6+12+3.5=21.5/3=7.16666666

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You are interested in estimating the the mean age of the citizens living in your community. In order to do this, you plan on con
Naddika [18.5K]

Answer:

The sample size is    n = 68

Step-by-step explanation:

From the question we are told that

    The margin of error is  E = 5 \ years

     The standard deviation is  \sigma = 22

From the question we are told the confidence level is  94% , hence the level of significance is    

      \alpha = (100 - 94 ) \%

=>   \alpha = 0.06

Generally from the normal distribution table the critical value  of  \frac{\alpha }{2} is  

   Z_{\frac{\alpha }{2} } =  1.881

Generally the sample size is mathematically represented as  

   n = [\frac{Z_{\frac{\alpha }{2} } *  \sigma }{E} ] ^2

=>  n = [\frac{1.881 } *  22 }{5} ] ^2

=>  n = 68

8 0
3 years ago
Help me plz thx alot
Simora [160]

It is 180 degrees- hope this helps!

4 0
3 years ago
Find the length of BD and EC.<br> A<br> D<br> 9<br> 8<br> B<br> с<br> BD =<br> EC =
hammer [34]
I think BD is 16 and EC is 9. hope this helps
6 0
3 years ago
Difference between mafic intermediate and felsic magmas
Inga [223]

Both are indicators of the chemical composition of silicate minerals, magmas and rocks.

Mafic is used for silicate minerals, magmas and rocks that are composed of heavier elements, like magnesium, iron, calcium and sodium. They are dark and have high specific gravities.

<span>Opposite to the this, felsic silicate minerals, magmas and rocks in their composition have less from these heavy elements. They are composed from silicon, oxygen, aluminium and potassium, are light in color and have lower specific gravities.</span>

8 0
3 years ago
I really need help pls. Its about 3d shapes
Svet_ta [14]

The image is blurry

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
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