Sponsors of a Local Charity Decided to Attract Wealthy Patrons

Multiple Choice

Sponsors of a local charity decided to attract wealthy patrons to its $500-a-plate dinner by allowing each patron to buy a set of 20 tickets for the gaming tables. The chance of winning a prize for each of the 20 plays is 50-50. If you bought 20 tickets,what is the chance of winning 15 or more prizes?

A) 0.250
B) 0.021
C) 0.006
D) 0.750