We perform the experiment "toss three coins" 1,000 times....?

there are 3 ways one head can appear and a total of 8 combinations of the 3 coins.

8 possible ways
H H H
H H T
H T H
T H H
T T H <-- one head
T H T <-- one head
H T T <-- one head
T T T

3/8 * 1000 = 375
 
For each experiment there are 8 possibilities.
HHH
HHT
HTH
THH
HTT *
THT *
TTH *
TTT

So the event "exactly one head" has a probability of 3/8.

Now we do the experiment 1000 times, so we expect the event to occur 1000 x 3/8 or 375 times.
 
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