Can you please help with the following questions and answer in detail how you came to conclusion of answer? Thank you. These are probability questions

Question #1

Three cards are drawn from a 52-card deck of cards. What is the probability that all three cards are hearts?

Question #2

Find the odds in favor of a five being rolled on a single die. What is the probability of this event?

Question #3

For a local retail store, the number of customers entering per hours and their corresponding probabilities are shown in the table below.

Probability

0.5

0.3

0.2

Customers

20

30

40

What is the stores expected number of customers entering the store per hour?