On a certain radio station, 70% of the songs are rock songs, and 30% of the songs are pop songs. The songs are selected independently. Each "block" of songs (a "block" is a set of songs between commercials) contains 10 songs. The DJ says that the next "block" of songs has at least 8 rock songs. Given this information, what is the probability that all 10 songs in that "block" will be rock songs?