Gwen has recently purchased a cottage. She has arranged

to have well dug on the property. One in five wells that

were dug recently in the vicinity were dry, and 30% of the

others were contaminated. Find the probability of each of

the following:

AGwen's well will not be dry

BGwen's well will be uncontaminated, given that it is not dry.

CGwen will have safe‐drinking water from her well.

DGwen will not have safe‐drinking water from her well.