Answer:
.375 or 6/16
Step-by-step explanation:
When you flip a coin you have 50/50 chance for it to land on heads or tail, assuming its not weighted or a trick coin.
Do this 4 times and the chances are now slimmer due to the amount of times it was flipped. In this case the probability of of you getting tails every time if you flip the coin 4 times is now .375 chance or 6/16. Here's the link to my work in a tree diagram
https://socratic.org/questions/if-you-flip-a-fair-coin-4-times-what-is-the-probability-that-you-will-get-exactl#398810
Paste this in to your search bar to get my tree diagram