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ANSWER
[tex]P(\frac{2}{3})=0.14[/tex]EXPLANATION
The probability that a plane will arrive on time is:
[tex]P(on-time)=0.75[/tex]This means that the probability that a plane will not arrive on time is:
[tex]\begin{gathered} P(not-on-time)=1-0.75 \\ P(not-on-time)=0.25 \end{gathered}[/tex]The probability that 2 out of 3 planes will arrive on time is the probability that 2 planes will arrive on time and that one will not arrive on time.
Therefore, we have to find the product of each probability:
[tex]\begin{gathered} P(\frac{2}{3})=0.75\cdot0.75\cdot0.25 \\ P(\frac{2}{3})=0.14 \end{gathered}[/tex]