The question is in the image below

Collins sampling method is the most effective.

Explanation:

There are a few reasons for this.

1. A much greater population of results

2. The people surveyed were chosen randomly so give a better insight into the population over all.

The second sampling method is a bit flawed in that it asks only 25 people, and these 25 people were sat near him and so may have similar interests therefore providing a degree of skew.

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq

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