It is expected that it would land on tails 15 times
Here, we want to get the number of times the coin will land on it tail
Mathematically, the probability that a coin will land on its head or on its tail is the same at 1/2
So the number of times out of 30 flips will be;
[tex]\frac{1}{2}\times30\text{ = 15 times}[/tex]