Question: What is the processor speed (mhz) for part number a80486dx4-75?
Schema: create table table_15261_1 (processor_speed__mhz_ varchar, part_number varchar, PRIMARY KEY (processor_speed__mhz_))
SQL: select count(processor_speed__mhz_) from table_15261_1 where part_number = "a80486dx4-75"