Awater well is being drilled in the desert where soil is either rock, clay, or sand. probability of rock p(r) = 0.42, probability of clay p(c) = 0.34, and probability of sand p(s) =0.24. a geological test gives positive results with 40% accuracy in rock, 50% accuracy with clay, and 80% accuracy in sand. given the test is positive, what is the probability that the soil is rock, p(rock|positive)? use bayes’ rule.

We are asked to solve for:

P (sand | positive)

So, we solve this by:

P (sand | positive) = P (sand)  x P (positive for sand)

P (sand | positive) = 0.26 (0.75)

P (sand | positive) = 0.195

The probability is 0.195 or 19.5%.

f(x) is the value of the function. b is the value of the function when x equals zero or the y-coordinate of the point where the line crosses the y-axis in the coordinate plane.

step-by-step explanation:

hope this !

all it means is function 3