Holbrook school officials have posted the opening for superintendent at a salary of $145,000 to $160,000. The departing superintendent, Joseph Baeta, accepted a job with the Norton public schools for next year. According to the posting, preliminary interviews will be conducted April 1 to 6, and finalists will be selected April 8. The School Committee is scheduled to appoint the new superintendent April 27, and the start date is July 1 for the 2013-2014 school year. The district has 1,242 students and a budget of about $12 million. The posted salary was comparable to six other postings last week on the website of the Massachusetts Association of School Committees, where salaries ranged from $130,000 to $180,000.