Eddie believes that if he flips a coin 650 times, it will land heads up exactly 325 times. what would you tell eddie about his prediction? plz me!

I would tell Eddie that he is correct if the coin is a fair coin (not weighted to favor one side).  Since coins have two sides, heads and tails, the probability of getting heads is 1 out of 2 or 1/2.  Same for tails (1 out of 2 or 1/2)
Since 325 is half of 650   (325/650 = 1/2) we know that the probability of getting heads in 650 flips is 1/2 or 325

In reality we might expect it not to be exactly 325 heads - could be 321 or 329 or even 338.   But we would not expect 35 heads and 615 tails.