p = 1/6, the probability of getting a '5' in a throw of the dice.
q = 1 - p = 5/6, the probability of not getting a '5'.
Number of trials = 8
Expected number of successes = 3
The probability is
₈C₃ (1/6)³ (5/6)⁵ = 56*0.00463*0.40188 = 0.1042
Answer: 0.1042