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%.

d. 9

step-by-step explanation:

in the table given in the picture, x is the input of the function and f(x) is the output on the given input. in the given table, it can be read as the value of function at -3 is it's respective value of f(x) which is -9.

as we have to find the value of f(3), we will see that what is the value of output on input 3. we can see in the table that the output value at x=3 is 9.

so, option d is the correct answer ..

not enough information

step-by-step explanation:

we cannot know this, because the other students could have handed out 10 flyers, or they could have handed out 100. one way, the mean would go up, and another way, the mean would go down.