HELP PLEASE!!

A multiple-choice test has 15 questions. Each question has 4 possible responses, so the
probability is 0.25 for guessing right. Suppose you randomly guess for all 15 questions.
Let X = the number of correct responses.

1. Calculate the mean of X. Interpret the mean in context.

2. Calculate the standard deviation of X. Interpret the mean in context.

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.