If a coin is tossed 50 times how many times expected to land on heads

The probability of getting heads is 1/2

That would mean the coin will have been weighted so that it's more likely to land on one face than the other. So when you toss a fair coin 50 times, you should expect to get roughly 25 Heads and 25 Tails. That is because Heads and Tails are equally likely.