Suppose Age is the following vector [ 18 25 -1 22 32 -1 ]. Give the matlab command(s) that change all the -1 values in Age to NaN.

Suppose Age is the following vector: [ 18 25 NaN 22 32 NaN ]. Write the Matlab command that calculates the mean age value excluding the missing values represented by the value NaN. There are a number of ways of doing this.