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: a) gwen’s well will not be dry. (b) gwen’s well will be uncontaminated, given that it is not dry. (c) gwen will have safe drinking water from her well. (d) gwen will not have safe-drinking water from her well.

A) 0.8
B) 0.24
C) 0.56
D) 0.44

For A, since 1 in 5 is dry, 4 in 5 are not; 4/5 = 0.8

For B, we know that 30%, 0.3, of the ones that are not dry are contaminated:
0.3(0.8) = 0.24

For C, 100%-30%=70% of wells that are not dry are not contaminated; 0.7(0.8) = 0.56

For D, she will either have contaminated water or no water:
0.24+0.2 = 0.44

The academic affairs council is the highest expert body processing academic affairs, as stipulated by the university statutes. specialist aaro häkkinen (educational policy) took part in the council’s meeting. the agenda of the meeting included bachelors’ feedback, the timing of pedagogical studies, the grant system for tuition fees, the standardisation of administrative practices for internships and the situation of foreign-language and multilingual master’s programmes.