The of the earth does not transmit s waves.

Earthquakes produce P- and S-waves which pass through the Earth. ... S-waves are not transmitted through the liquid outer core. This produces a 'shadow zone' on certain parts of the Earth's surface where S-waves are not recorded, and this is used as the main piece of evidence to deduce the size of the core.

Since wxyz is 4, halfof that would be 2.

Answer were lower;