The likelihood that a student will go to the cafeteria during a class break is 0.25. [n a sample of 4 students, determine the probabilities ofthe following events: a.x=2 b..\\'=3 The waiting time for customers at MacBurger Restaurants follows a normal distribution with a population standard deviation of 1 minute. At the Warren Road MacBurger, the qualityr assurance department sampled 50 customers and found that the mean waiting time was 2.?5 minutes. At the 0.05 signicance level, can we conclude that the mean waiting time is less than 3 minutes