SOLUTION
The probability of an event occuring is found using the formula
[tex]\frac{possible\text{ outcome}}{\text{total possible outcome }}[/tex]There is only "one" 4, in a die, out of a total of "six" numbers labelled 1 to 6.
So, possible outcome = 1
Total possible outcome = 6, since the die was tossed once.
Probability becomes
[tex]\frac{1}{6}[/tex]Hence the answer is
[tex]\frac{1}{6}[/tex]