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3 years ago

The density of aluminum is 2.7 g cm3 what is its density in kilograms per cubic meter

Mathematics

1 answer:

maw [93]3 years ago

3 0

The only thing that we have to do in this problem is to convert the units.

We know that:

1000 g = 1 kg

100 cm = 1 m

Therefore:

density = (2.7 g / cm^3) * (1 kg / 1000 g) * (100 cm / m)^3

<span>density = 2700 kg / m^3</span>

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Step-by-step explanation:

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3 years ago

An SRS of 450 450 high school seniors gained an average of ¯ x = 20 x¯=20 points in their second attempt at the SAT Mathematics

maria [59]

Answer: (15.47, 24.53)

Step-by-step explanation:

We know that the confidence interval for population mean is given by :_

$\overline{x}\pm z^*\dfrac{\sigma}{\sqrt{n}}$

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$\sigma$ = standard deviation.

$\overline{x}$ = sample mean.

z*= Critical value.

Given : n= 450

$\overline{x}=20$

$\sigma=49$

Critical value for 95% confidence = z*=1.96 [From z-value table]

Then, the 95% confidence interval will be :-

$20\pm (1.96)\dfrac{49}{\sqrt{450}}$

$\approx 20\pm (1.96)(2.31)$

$\approx 20\pm 4.53$

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Hence, the 95% confidence interval for the mean change in score μ μ in the population of all high school seniors. : (15.47, 24.53)

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3 years ago