Create a column of monthly returns for a portfolio that each month was invested equally across the 30 stocks. calculate the mean and standard deviation of returns of this portfolio and explain how they relate to the mean returns and standard deviations of return of the 30 stocks individually.

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.