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$P\left(A\right)=0.13$ is the probability that the person has chosen did not finish high school.$P\left(B\right)=0.29$ indicates the probability that the person has a high school diploma but no more schooling. $P\left(C\right)=0.30$indicates that the person has at least a bachelor's degree.

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(did not complete high school) = $0.13$

P(Complete high school diploma) =$0.29$

P(Bachelors degree) = $0.30$

The probability distribution requirements are as follows: $0鈮�p鈮�1$

1)The probability should be considered $1$

2) The total of all probability should equal$1$

Using the second condition, $$\begin{gathered} 0.13+0.29+0.30+p\left(other\right)=1 \\ p\left(other\right)=1-0.72=0.28 \end{gathered}$$

$P\left(A^c\right)=1-P\left(A\right)$

Using the formula of complementary probability,

$$\begin{gathered} P(atleasthighschool)=1-P(nothighschool) \\ =1-0.13 \\ =0.87 \end{gathered}$$