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3 years ago

Is -9 a rational number? yes no

Mathematics

2 answers:

Yuri [45]3 years ago

7 0

Answer:

yes

Step-by-step explanation:

Harlamova29_29 [7]3 years ago

5 0

Answer:

Yes

Step-by-step explanation:

-9 is a rational number

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A random sample of 10 parking meters in a beach community showed the following incomes for a day. Assume the incomes are normall

Vlad1618 [11]

Answer: (2.54,6.86)

Step-by-step explanation:

Given : A random sample of 10 parking meters in a beach community showed the following incomes for a day.

We assume the incomes are normally distributed.

Mean income : $\mu=\dfrac{\sum^{10}_{i=1}x_i}{n}=\dfrac{47}{10}=4.7$

Standard deviation : $\sigma=\sqrt{\dfrac{\sum^{10}_{i=1}{(x_i-\mu)^2}}{n}}$

$=\sqrt{\dfrac{(1.1)^2+(0.2)^2+(1.9)^2+(1.6)^2+(2.1)^2+(0.5)^2+(2.05)^2+(0.45)^2+(3.3)^2+(1.7)^2}{10}}$

$=\dfrac{30.265}{10}=3.0265$

The confidence interval for the population mean (for sample size <30) is given by :-

$\mu\ \pm t_{n-1, \alpha/2}\times\dfrac{\sigma}{\sqrt{n}}$

Given significance level : $\alpha=1-0.95=0.05$

Critical value : $t_{n-1,\alpha/2}=t_{9,0.025}=2.262$

We assume that the population is normally distributed.

Now, the 95% confidence interval for the true mean will be :-

$4.7\ \pm\ 2.262\times\dfrac{3.0265}{\sqrt{10}} \\\\\approx4.7\pm2.16=(4.7-2.16\ ,\ 4.7+2.16)=(2.54,\ 6.86)$

Hence, 95% confidence interval for the true mean= (2.54,6.86)

7 0

4 years ago

301 round to the nearest ten

Nadusha1986 [10]

It is 300 because 1 is less than 5

4 0

4 years ago

Read 2 more answers

25 Trent's watch runs at half the speed itshould. In other words, the hands on thewatch move only a half hour when an hourof tim

sergeinik [125]

Given that Trent's watch runs at half the speed it should run, this implies that

for every hour passed, his watch moves by half an hour.

Hence, for every half-hour passed, Trent's watch moves by 15 minutes.

Hence, when the real time is 10:30 am, Trent's watch will show 9:15 am.

6 0

1 year ago

Which two triangles are congruent by the ASA Theorem? Complete the congruence<br><br> statement

astraxan [27]

It would sure help a lot if I could take a peek at the drawings of the triangles.

7 0

3 years ago

Read 2 more answers

17 friends to 18 friends (round to the nearest percent)

konstantin123 [22]

Answer:

5.88%

Step-by-step explanation:

18 - 17 / 17

1/17 = 0.0588

= 5.88%

7 0

2 years ago