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3 years ago

What expression is equivalent to 9(9m + 3t)?

Mathematics

2 answers:

Novosadov [1.4K]3 years ago

6 0

Answer:

81m + 27 t

Step-by-step explanation:

Tcecarenko [31]3 years ago

3 0

Answer:

81m+27t

Step-by-step explanation:

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

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Answer:

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

Step-by-step explanation:

Our test statistic is:

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

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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:

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

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