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2 years ago

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Andros has an oil fired heating system. In a 30-day period he used a full tank of oil at a constant rate per day. At a different

time of the year the amount of oil Andros uses per day is 1 3 of the rate used in the 30-day period. (a) How many days should a full tank of oil?

1 answer:

Bingel [31]2 years ago

3 0

Step-by-step explanation:

30 days period multiply by 7 days

=210 therefore our answer is =210

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<h3>How to calculate the correlation coefficient</h3>

The correlation coefficient (r) is calculated as:

$r = \frac{n(\sum xy) - \sum x \sum y}{\sqrt{[n \sum x^2 - (\sum x)^2][n\sum y^2 - (\sum y)^2}}$

Using the given parameters, we have:

$r = \frac{20 *8249 - 1257* 116}{\sqrt{[20 * 98823 - 1257^2][20 * 836 - 116^2}}$

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Evaluate the root

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Evaluate the quotient

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Hence, the correlation coefficient is 0.53

Read more about correlation coefficient at:

brainly.com/question/1564293

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