David W. answered • 10/17/16
Tutor
4.7
(90)
Experienced Prof
If it is equally-likely that any one of the 400 tickets sold may be selected to receive first prize, then the probability of winning is defined as:
(number of successes) / (total number of possibilities)
successes = 10 [10 are successful, if chosen]
total possibilities = 400 [any one of 400 could be chosen]
Probability = 10/400 = 1/40 (0r, 0.025)
