The average american adult has completed an average of 11.25 years of education with a standard deviation of 1.75 years. a random sample of 75 adults is taken.
a) what is the probability that the sample will have a mean more than 11.5?
b) what is the probability that the sample will have a mean between 11 and 12 years?

Naruto is choosing between two venues that will deliver food to his house. with probability 1/3 he will choose ramen mania (r), and with probability 2/3 he will choose sushi (s). if he chooses r, 15 minutes after making the call, the remaining time it takes the food to arrive is exponentially distributed with average 10 minutes. if he orders s, 10 minutes after making the call, the time it takes the food to arrive is exponentially distributed with an average of 12 minutes. given that he has already waited 25 minutes after calling, and the food has not arrived, what is the probability that he ordered from r? i am really stuck on how to set this up, so if you could be extra clear, that would be super ! in advance