a coin is tossed 4 times. what is the possibility that exactly half the tosses results in heads?

i don`t really understand this problem and i need help
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probability = # ways what you want happens / # ways everything happens

# ways to get 2 heads from 4 tosses: 4!/(2!*2!) = 24/(2*2) = 6

# ways everything happens (coin tossed 4 times) = 2^4 = 16

probability (2 heads in 4 tosses) = 6/16 = 3/8
by Level 13 User (103k points)

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