Blake is a retired railroad conductor who lives alone. The highpoint of his day is when the mail truck arrives; however, this also proves to be a daily frustration. The mail courier does not keep a tight schedule, and is extremely inconsistent about delivery times. This drives Blake crazy. Although not happy about it, Blake is being reinforced on a variable-interval schedule.

Question

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Blake is being reinforced on a variable-interval schedule because the mail courier's arrival time is inconsistent, making it unpredictable when the reinforcement (the arrival of the mail) will occur.

Blake Is a Retired Railroad Conductor Who Lives Alone