2 years ago

Round 4572 correct to 2 significant figures

Mathematics

1 answer:

Advocard [28]2 years ago

8 0

4600
Because the zeros aren’t significant unless they’re after a decimal point, but other numbers are significant.

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Solve the system by substitution.<br> y = 4x + 22<br> y = -7x

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Answer:

x=-2

y=14

Step-by-step explanation:

-7x=4x+22

-11x=22

x=-2

y=-7(-2)

y=14

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3 years ago

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What is the sum of 4n² + 2n+ 12

Alex

Answer:

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Step-by-step explanation:

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2 years ago

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 7.5 parts

Hunter-Best [27]

Answer:

The value of the test statistic is $t = 2.1$

Step-by-step explanation:

Our test statistic is:

$t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the expected value, $\sigma$ is the standard deviation and n is the size of the sample.

The level of ozone normally found is 7.5 parts/million (ppm).

This means that $\mu = 7.5$

The mean of 24 samples is 7.8 ppm with a standard deviation of 0.7.

This means that $X = 7.8, \sigma = 0.7, n = 24$

Test Statistic:

$t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

$t = \frac{7.8 - 7.5}{\frac{0.7}{\sqrt{24}}}$

$t = 2.1$

The value of the test statistic is $t = 2.1$

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3 years ago

Round 4572 correct to 2 significant figures​

Round 4572 correct to 2 significant figures