Information about the age of participants in a robotics competition is below: image here

The middle 50% of the data is between what two numbers?

16 and 33
13 and 31
11 and 33
11 and 16

Atutoring service offers a free one-hour tutoring session. after a client signs up, the next 10 hours of tutoring are billed at a rate of $30 per hour. for all the hours after that, the client receives a discounted rate. if a client pays $664 for 25 hours of tutoring, what is the service's discounted hourly rate? a) $24.50 b) $25.54 c) $26.00 d) $26.56