Answer:
The percent of the problems did Dewayne answer correctly = 86.6%
Explanation:
Given DeWayne missed four of the 30 problems on the problem set
let "E" be the event of missing problem set P(E) =

Let
be the event of DeWayne answer correctly
P(
) = 1 - p(E)
=

=

=
= 0.866
The percent of the problems did Dewayne answer correctly = 86.6%