Answer
$.25$
Work Step by Step
We are interested in the event $E=${1,0} (Marginal or Poor)
The sample size is $N=16$,
The frequency of $E$ is $fr(E)=2+2=4$
The relative frequency of $E$ is $P(E)=\frac{fr(E)}{N}=\frac{4}{16}=.25$
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