For two-point attempts: E[x] = 2 * 0.44 = 0.88
For three-point attempts, follow the same logic:
value if point is made * probability of making shot...
This gives you an EXPECTED VALUE for a certain shot... You can think of an expected value as essentially a "mean" value. Or a "price tag" value. For example, suppose you buy a lottery ticket for a dollar and you have a 30% chance of winning two dollars, and a 70 percent chance at winning nothing. (This is strictly an example) So, how much is each ticket actually worth (exclude the cost of paper, ink, etc)? Well, for a ticket, you win $0.00 seventy percent of the time (0*.70) and 2 dollars 30 percent of the time (2 * 0.30). Add them up: (0 * 0.70) + (2 * 0.30) = 0 + 0.60 = 0.60. The ticket you just spent a dollar on has an expected value of 60 cents. Is this clear?