Calculating the density parameter (Cosmology)

[Hangst]

Homework Statement

Decide the density parameter from the following data:

z=0.04, m= 17.38 and σ=0.19

Homework Equations

Definition of the density parameter:

Where p0 is the current density and pc is the critical density.

The Attempt at a Solution

I feel like I don't have enough information to calculate it as I'm unable to calculate the current density of the universe. Any help is greatly appreciated! Thanks.

 

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Two pictures of an attempt at a solution (no units)>

and

 

[Hangst]

Hello? (hello)
Is there anybody in here?