Please help with part A and B. Thank you.

3) Earlier in Module 2 you learned about expected value, which is the mean of a random variable. Let's apply this concept to flipping 4 coins. PartA) Take an educated guess (we'll actually compute it soon enough): if you toss 4 coins, what would be the expected value of the number of heads? The mean should be around 2. O The mean should be around 0 O the mean should be around 4 3B) The formula for expected value is u = E . P(x). Below is the table from the previous exercise, with another column added on the right. Fill in the probabilities from the previous table, then calculate x . P(x) for each row. Give the expected value (u) as the sum of values in the last column. The expected value is