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:
Behaviour Therapy
A therapeutic approach focused on modifying maladaptive behaviors through learning principles and techniques such as conditioning and reinforcement.
Self-Knowledge
The understanding a person has of their own personal characteristics, emotions, motivations, and desires.
Insight Therapy
A type of psychotherapy aimed at increasing a patient's awareness of underlying motives and defenses to facilitate change.
Personality
The combination of characteristics or qualities that form an individual's unique character.
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