Please provide an SQL command and perform the following actions:
1. Merge database tables' student_score 'and' student_gender ' by ' name '
2. Find the student_ Everyone with a class of 1 and a gender of boy in gender
3. And calculate the average value of 'total_score' from the student_score Provide your response in exactly 5 paragraphs (separated nearby paragraphs with 3 aterisk symbols ***).
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