My Mom Wants Me To Solve These Probability Questions But I Dont Get It :(

1. Copy and complete: When a coin is flipped 20 times and lands heads
up 11 times, the _?_ probability that the coin lands heads up is 11/20.

2. The odds in favor of event A are 2 to 1. The odds against event B are
2 to 1. Which event is more likely to occur, event A or event B?
In Exercises 3–5, suppose you roll a number cube. Find the probability of
the event.
3. A prime number 4. A multiple of 2 5. A number less than 5.....

This crap it hard -__-

1. The 11/20 figure is clearly based on the results of previous coin flips (11 heads out of 20 flips), so 11/20 is the *experimental* (or *empirical*) probability.

2. Since the odds in favor of A are 2 to 1, A is more likely than not to occur; the probability of A is more than 50-50.
Since the odds against B are 2 to 1, B is less likely than not to occur; the probability of B is less than 50-50.
So A is more likely than B.

For 3-5, there are 6 possible outcomes, namely 1-6.

3. Of these outcomes, three are primes: 2, 3, 5. (1 is considered to be neither a prime nor a composite.)
So the probability of a prime is 3/6 = 1/2.

4. Of these outcomes, three are multiples of 2: 2, 4, 6.
So the probability of a multiple of 2 is 3/6 = 1/2.

5. Of these outcomes, four are less than 5: 1, 2, 3, 4. So the probability of a number less than 5 is 4/6 = 2/3.

Lord bless you today!