In the graph, the number of samples collected is increasing at the rate of % per day.

0.8

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-1.2

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-0.8

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1.2

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Solution

The correct option is A 0.8
Consider the points (1, 0.8) and (3, 2.4) on the line.

You know,
$Unit rate = Slope = \frac{R i s e}{R u n}$
$= \frac{C h a n g e i n y}{C h a n g e i n x}$
$= \frac{2.4 - 0.8}{3 - 1}$
$= \frac{1.6}{2} = 0.8$

$∴ U n i t r a t e = + 0.8$

As the unit rate is positive, the graph is increasing.

So, the number of samples collected is increasing at the rate of 0.8% per day.

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