Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_40541 ( "Air Date" text, "Timeslot" text, "Rating" real, "Share" real, "18-49" text, "Viewers" real, "Weekly Rank" text )

### Question ###
What is the average share at 8:00 p.m., and an 18-49 of 1.3/4 with an air date of April 4, 2008?

### Accurate SQL ###

SELECT AVG("Share") FROM table_40541 WHERE "Timeslot" = '8:00 p.m.' AND "18-49" = '1.3/4' AND "Air Date" = 'april 4, 2008'