Ocessing of raw coal involves "washing," in which coal ash (nonorganic, incombustible material) is removed. the article "quantifying sampling precision for coal ash using gy’s discrete model of the fundamental error" (journal of coal quality, 1989: 33–39) provides data relating the percentage of ash to the volume of a coal particle. the average percentage of ash for six volumes of coal part was measured, and represented below: volume (cm3) 0.01 0.06 0.58 2.24 15.55 276.02% ash 3.32 4.05 5.69 7.06 8.17 9.36compute the least square line for predicting percent ash from in volume.

y = 5.5765*x + 0.0142

Step-by-step explanation:

Let's consider the volume as the explanatory variable x and the percentage of ash as the response variable y

We construct the following table

Once this table is built, the rest is easy.

The least squares line is given by

y = mx + b

where  

where n is the number of observations taken, in this case 6.

Computing all these values we have our least squares line

And that's it!

the distance from any point on the parabola to the focus is the exact same as the distance from that point to the directrix.

if you could provide answer choices that might allow me to answer the question easier if my above answer isn't an option! (:

answer: the answer is 127 degrees