The graph shows the speed of a vehicle during the final 50 seconds of a journey. At the start of the 50 seconds its speed is k metres per second. The distance travelled during the 50 seconds is 1.7 kilometres

can you work out the average speed of the vehicle during the 50 seconds of the journey?

Suppose you just purchased a digital music player and have put 8 tracks on it. after listening to them you decide that you like 4 of the songs. with the random feature on your player, each of the 8 songs is played once in random order. find the probability that among the first two songs played (a) you like both of them. would this be unusual? (b) you like neither of them. (c) you like exactly one of them. (d) redo () if a song can be replayed before all 8 songs are played.