Can someone please help me with this I’m stuck on it

Mathematics

1 answer:

Brut [27]2 years ago

4 0

Answer:

B and C. if you got them wrong let me know :3

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A study has indicated that the sample size necessary to estimate the average electricity use by residential customers of a large

Zanzabum

Answer:

$\sigma=547.1125$

Step-by-step explanation:

-The margin of error is calculated using the formula:

$ME=z_{\alpha/2}\times \frac{\sigma}{\sqrt{n}}\\\\$

-We substitute the values, n=900 and ME=30 in the formula to solve for standard deviation:

$ME=z_{\alpha/2}\times \frac{\sigma}{\sqrt{n}}\\\\\\30=1.645\times\frac{\sigma}{\sqrt{900}}\\\\\sigma=\frac{30^2}{1.645}\\\\=547.1125$

Hence, the population standard deviation is 547.1125

7 0

3 years ago

Plz HELP BRAINLIEST IF CORRECT IM KINDA IN A RUSH PLZ HELP ;)

baherus [9]

Answer:

0.5 quarts of orange juice per quart of punch

Step-by-step explanation:

1.5/3=0.5

7 0

3 years ago

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The scale drawing car length is 3 cm. If the scale is 1 cm:4 ft, what is the actual car length?

musickatia [10]

12 feet is the answer. 4 times 3 is 12.

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2 years ago

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How to answer the question

bulgar [2K]

That is sudoku, a game that I am really good at. first off the square on the left in the middle is messed up, because on the square above it there is a 5 where it would make the 5 in the middle left square incorrect. So you have to erase the 5 in the square on the middle left. Then if you can do sudoku, you could do the rest.

hope I helped!

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3 years ago

Find the sum. 5 2a a? + 2a + 1 + a2 + 4a + 3

Salsk061 [2.6K]

$\frac{2a}{a^2+2a+1}+\frac{5}{a^2+4a+3}$