It costs 1.75$ for 250 envelopes. each one of the envelopes cost 0.007$
This question is asking only for the slope of the regression equation. This slope can be easily calculated using the following rule:
slope = SP / SSx
Examining the givens, we will find that both parameters are given where:
SP = 30 and SSx = 10
Substituting with the givens in the above mentioned equations, we can calculate the slope as follows:
slope = 30 / 10 = 3
There are 2 ways to find. Check this out mate! I hope this helped.
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C is correct because the first point is on 0
