A standard six-sided die has the numbers 1 through 6, so there are 6 possible outcomes when you roll the die.

The number 4 is just one of these outcomes. Therefore, the probability of rolling a 4 is:

$\frac{1}{6}$

Expressing this as a decimal:

$\frac{1}{6} \approx 0.1667$

So, the probability of rolling a number equal to 4 is $\frac{1}{6}$ or approximately 0.1667.

Do you want further details or have any questions?

Here are 5 related questions:

1. What is the probability of rolling an odd number on a six-sided die?
2. What is the probability of rolling a number greater than 3?
3. If two six-sided dice are rolled, what is the probability of getting a sum of 7?
4. What is the probability of rolling a prime number on a six-sided die?
5. What is the probability of not rolling a 4?

Tip: For probability problems, always ensure the total number of possible outcomes is accurately identified to avoid errors.