Assuming that all stations are occupied and all lines are observed in both directions, compute the strength of figure factor for a pentagon with interior station.
0.47
0.57
0.67
0.77
\[
c = (n’ – S’ + 1) + (n – 2s + 3)
\]
\[
c = (10 – 6 + 1) + [10 – 2(10) + 3]
\]
\[
c = (10 – 6 + 1) + (10 – 12 + 3)
\]
\[
c = 6
\]
\[
F = \frac{D – c}{D}
\]
\[
F = \frac{18 – 6}{18}
\]
\[
F = 0.67 \leftarrow \text{answer}
\]