If you roll a 6-sided die 18 times, what is the best prediction possible for the number of times you will roll a four?

The best prediction for the number of times you will roll a four when rolling a 6-sided die 18 times can be found by calculating the expected value. Since there is one four on the die, the probability of rolling a four on any single roll is ( frac{1}{6} ).

Now, multiply the probability by the number of rolls:

[

text{Expected rolls of four} = 18 times frac{1}{6} = 3

]

Thus, the best prediction possible for the number of times you will roll a four is B) 3 times.