Molly's Mail Carrier Delivers the Mail Promptly at Noon Each

question 158

Multiple Choice

Molly's mail carrier delivers the mail promptly at noon each day.Molly never checks her mailbox in the morning but always checks it at 12:05 p.m.Molly's mail checking is maintained on which type of schedule?

• A)fixed-interval
• B)variable interval
• C)fixed-ratio
• D)variable ratio