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3 years ago

PLEASE HELP!!!11!!! what is the reciprocal of 4 -1/4 1 4 1/4

Mathematics

1 answer:

adell [148]3 years ago

6 0

Answer:

1/4

Step-by-step explanation:

The reciprocal of 4 is the fraction 1/4. To find the reciprocal, we switch the placement of the numerator and the denominator. 4 is the simplified fraction 4/1 so its reciprocal becomes 1/4.

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In 36 randomly selected seawater samples, the mean sodium chloride concentration was 23 cubic centimeters per cubic meter. Assum

Ludmilka [50]

Answer: 90% confidence interval for population mean =(21.163, 24.837)

95% confidence interval for population mean =(20.811, 25.189)

Step-by-step explanation:

Confidence interval for population mean ( $\mu$ ) is given by :-

$\overline{x}\pm z \dfrac{\sigma}{\sqrt{n}}$ , where n= sample size, z= critical z-value , $\overline{x}$ = sample mean $\sigma$ = population standard deviation.

Given : n= 36 , $\overline{x}=23$ cubic centimeters per cubic meter.

$\sigma=6.7$ cubic centimeters per cubic meter

For 90% confidence level , z= 1.645 [by z-table]

Then, required interval for population mean ( $\mu$ ) would be :

$23\pm (1.645) \dfrac{6.7}{\sqrt{36}}$

$=23\pm 1.837$

$=(23-1.837 , 23+ 1.837)=(21.163, 24.837)$

For 95% confidence level , z= 1.96 [by z-table]

Then, required interval for population mean ( $\mu$ ) would be :

$23\pm (1.96) \dfrac{6.7}{\sqrt{36}}$

$=23\pm 2.189$

$=(23-2.189 , 23+ 2.189)=(20.811, 25.189)$

Hence, 90% confidence interval for population mean =(21.163, 24.837)

95% confidence interval for population mean =(20.811, 25.189)

5 0

3 years ago

NEED HELP URGENT PLEASE IMAGE IN DESCRIPTION NO TROLL PLEASE BE NICE!!!

LiRa [457]

Answer:

23-5= 18

Step-by-step explanation:

4 0

3 years ago

Hurry please!! Thank you so much to whoever answers!

mestny [16]

Answer:

D 9 $\sqrt{3}$

Step-by-step explanation:

The measure of the third sidelength, or x is 15.58

9 $\sqrt{3}$ = 15.58

Hope this helps

5 0

3 years ago

Read 2 more answers

1. {2, 7, 14, 12, 13, 21, 12, 12, 6, 8, 12)<br> Mean -<br> Median -<br> Mode -

Marysya12 [62]

Step-by-step explanation:

mean is when you add all of them up and then divide by how many numbers there are.

median is the number In the middle .the middle number is 21 .

mode : number that appears the most . answer is 12

7 0

3 years ago

which complex number has a distance of √17 from the origin on the complex plane?a. 2 15ib. 17 ic. 20 - 3id. 4 - i

Rus_ich [418]

Let $z=a+bi$ . $|z| = \sqrt{a^2+b^2}$ , so:
$|z_a| = \sqrt{0+15^2} = 15 \neq \sqrt{17} \\ |z_b| = \sqrt{0+17^2} = 17\neq \sqrt{17} \\ |z_c| = \sqrt{20^2+3^2} \ \textgreater \ \sqrt{20^2} = 20\ \textgreater \ \sqrt{17} \\\\ \boxed{|z_d| = \sqrt{4^2+1^2} = \sqrt{16+1} = \sqrt{17}}$

4 0

4 years ago