Use the figure to answer the following question(s) .
Figure 8-9 
-In Figure 8-9, which output would minimize the firm's average total cost of production?
Definitions:
Signal-detection Theory
A method for measuring the capacity to differentiate informative patterns from random, distracting ones.
False Alarm
An instance where a warning or signal is given, but no real danger or threat actually exists; it can also refer to a mistaken belief that a target or signal has been detected.
Low Threshold
Refers to a situation or condition that requires a minimal stimulus to elicit a response or reaction.
Sensory Adaptation
A phenomenon of the sensory system in which sensitivity to a constant stimulus decreases over time.
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