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bixtya [17]
3 years ago
15

Which is the correct solution of the system of linear equations?

Mathematics
1 answer:
erma4kov [3.2K]3 years ago
8 0
Number one is the correct one i think
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A study of 420 comma 000 cell phone users found that 134 of them developed cancer of the brain or nervous system. Prior to this
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Answer: (0.00306,0.00334)

Step-by-step explanation:

Given : Sample size : n= 420000

The number of users developed cancer of the brain or nervous system =134

Then , the proportion of users developed cancer of the brain or nervous system :

p=\dfrac{134}{420000}\approx0.0032

Significance level : 1-0.90=0.1

Critical value : z_{\alpha/2}=1.645

The confidence interval for population proportion is given by :-

p\ \pm\ z_{\alpha/2}\sqrt{\dfrac{p(1-p)}{n}}\\\\=0.0032\pm (1.645)\sqrt{\dfrac{(0.0032)(1-0.0032)}{420000}}\approx0.0032\pm0.00014\\\\=(0.00306,0.00334)

Hence, the 90​% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system is (0.00306,0.00334).

4 0
3 years ago
Subtract and simplify. 12 3\8 − 9 1\8 =
Ber [7]

Answer:

3\dfrac{1}{4}  \ \  or  \ \  3,25

Step-by-step explanation:

\displaystyle12 \frac{3}{8} -9\frac{1}{8} =12-9+\frac{3}{8} -\frac{1}{8} =3+\frac{2}{8} =3\frac{1}{4}  \ \  or  \ \  3,25

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2 years ago
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3 years ago
What is the average speed of a biker if she biked 4 1/4 of a mile in 25 minutes?
nata0808 [166]

Answer:

Step-by-step explanation:

What is the average speed of a biker if she biked 4 1/4 of a mile in 25 minutes?

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

rate = distance/time

-----

rate = (17/4)/(25/60) = (17/4)(60/25) = (17*3/5) = 51/5 = 10.2 mph

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