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An event is a subset of an experiment's total number of outcomes. The ratio of the number of elements in an event to the number of total outcomes is the probability of that occurrence.

P(Business bachelor's degree) = $0.20$

P(Other topics of study for undergraduates) = $0.15$

P(Graduates who are working) = $0.60$

P(Graduates who have not found work) = $0.05$

Formula:

$P(AorB)=P\left(A\right)+P\left(B\right)$

Using formula,

$P(Undergraduateinbu\sin essorUndergraduateinotherfields)=P(Undergraduateinbu\sin ess)+P(Undergraduateinotherfields)=0.20+0.15=0.35$

P(Business bachelor's degree) =$0.20$

P(Other topics of study for undergraduates) = $0.15$

P(Graduates who are working) = $0.60$

P(Graduates who have not found work) = $0.05$

Formula:

$P\left(Ac\right)=1-P\left(A\right)$

Using the complementary probability formula,

$P(notundergraduatebu\sin ess)=1-P(undergraduatebu\sin ess)=1-0.20=0.80$