The average depth of the world ocean is approximately 12,080 feet (3,682 meters). This value includes both shallow coastal areas and deep ocean trenches, giving an overall average depth for the entire ocean.

The average depth of the Indian ocean is I dont know honestly

the average depth is 3456m

There are so many different depth levels of the ocean, it is pretty much impossible to calculate the average depth unless every part of the ocean is measured.

Update: The average is 3,700 meters.

Wikipedia gives the average depth of the World Ocean (that's taking all the Oceans as one continuous body of water) as 3,790 metres (12,430 ft),

False. The deepest ocean in the world is the PacificOcean with an average depth of 13,740 feet ( 4,188 meters). The Atlantic Ocean only comes in at third place (after the Indian ocean) at a 700 meters (2,300 ft) less average depth .