Question

You have 160 songs on your MP3 player. Ihe probability of randomly choosing a rock song is 30%. How many of the songs on your MP3 player are not rock songs?

Answer 1

160x.30=48
So you have 48 rock songs

Answer 2

Total songs = 160

probability of randomly choosing a rock song is 30%. This means 30% of your songs are rock songs.

Number of rock songs = 160 × 30/100 = 48

So, Number of songs which are not rock songs = 160 - 48 = 112

Hence, 112 songs on your MP3 player are not rock songs.