Why aren't voluntary response samples usually representative of the population

a: the people who volunteer will be the only ones you are not represented

b: the people who don't volunteer will be the only ones that are represented

c: the people who volunteer usually have a motive to do so and will be the only ones represented

d: the people who don't volunteer probably have really strong opinions of the subject

Marcus built a model car that is 4 inches wide. what scale was used to build the car if the actual width of the car is 6 feet? a. 1 in. = 2 ftb. 1 in. = 2.5 ftc. 1 in. = 1.5 ftd. 1 ft = 1.5 in.

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

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.