The compilation is a selection of tracks that the former X Factor star has been working on in the studio and songs that have inspired her.
Fans can download Why Hello World via Misha B's Facebook page.
Fellow X Factor star Marcus Collins, who wants to duet with Misha B, has supported the mixtape on Twitter, saying: "misha your mixtape is HOTTTT! I love u x."
Cheryl Cole is also said to have expressed an interest in working with Misha B.
She finished fourth in last year's X Factor, behind Amelia Lily, Marcus Collins and eventual winners Little Mix.
The tracklist for Why Hello World is as follows:
1. Why Hello World Misha B Intro
2. Misha B - 'Big Dreaming'
3. Weeknd feat. Drake - 'Crew Love' (Can't You See Refix)
4. TLC - 'Unpretty' Original / Misha B Cover (Cut)
5. Beyonce - 'Run the World' (Stylus Refix)
6. Misha B - 'Last Forever'
7. Misha B - 'Home Run'
8. Adele - 'Rolling in the Deep' (Classic Hip Hop Blend) / Misha B Cover
9. Usher - 'Climax'
10. Lil Wayne feat. Bruno Mars - 'Mirror' Original / Misha B Cover