The following table shows part of the probability distribution for the number of boats sold daily at Boats Unlimited. It is known that the average number of boats sold daily is 1.57. 
Compute the variance and the standard deviation for this probability distribution.
Definitions:
Solid-State Switches
Electronic switches that operate without moving parts, using semiconductor devices to switch on or off.
Electrical Noise
Unwanted disturbances superimposed on a useful signal that tend to obscure its information content.
Airborne Contaminants
Particles or gases in the air that can be harmful to health or the environment, originating from various sources like industrial processes or natural phenomena.
Signal Wiring
The physical connections between electronic devices through which electrical signals are sent and received, essential for the communication within control systems.
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