2 years ago

Eight times the sum of a number and 9 equals 7.

Mathematics

1 answer:

Dominik [7]2 years ago

8 0

Answer:

8(x+9)=7

comment if you need anything else like solving for x

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A random sample of 64 items is selected from a population of 400 items. The sample mean is 200. The population standard deviatio

Usimov [2.4K]

Answer: $(188.24,\ 211.76 )$ .

Step-by-step explanation:

Given : Sample size : n= 64 , the sample is a large sample (n>30), so we can apply z-test.

Sample mean = $\overline{x}=200$

Standard deviation : $\sigma=48$

Level of confidence: $1-\alpha=0.95$

$\Rightarrow\ \alpha=0.05$

Then, critical z-value = $z_{\alpha/2}=1.96$

The confidence interval to estimate the population mean is given by :_

$\overline{x}\ \pm\ z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

$=200\ \pm\ (1.96)\dfrac{48}{\sqrt{64}}\\\\=200\pm11.76=(200-11.76, 200+11.76)=(188.24,\ 211.76 )$

Hence, the 95% confidence interval to estimate the population mean can be computed as $(188.24,\ 211.76 )$ .

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3 years ago

Pleas help me find the area of this compound shape I will give you loads of points

worty [1.4K]

Answer:

Step-by-step explanation:

4*7 = 28

(14 - 1 - 4) * (7 - 4) = 27

1 * 7 = 7

7 + 28 + 27 = 62

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2 years ago

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The exchange rate is £1 = $1.12 how many £ would I get for €336

raketka [301]

£376.32 is the answer.
Working:
€336 x the exchange rate(1.12)

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Step-by-step explanation:

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Step-by-step explanation:

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