Form an even number

The fundamental experiment is the forming of a number of five different digits . The number of ways of doing this is $9P5=15120$ .

The number of ways in which we can form an even number of five different digits is $8\times 7 \times 6\times 5\times 4=6720$ .

Therefore, the desired probability is $\dfrac{6720}{15120}=$ $\dfrac{4}{9}=$ $\boxed{0.444}$