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%.
The answer is 24m^2 i just finished that test and that was the answer.<span />
Penny- 3g
nickel-5g
dime- 2g
quarter-6g
half dollar- 11g
She scored better with math