Niche competition

i have found a keyword with 40k global searches.
here is competition result by Traffic Travis :-

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#1- Wikipedia
#2- YouTube video
#3- authority site
#4- about.com
#5- authority site
#6- wallpaper website
#7-facebok fan page
#8-wallpaper site
#9- bbc.co.uk


Is this keyword is easy to rank Traffic Travis is showing medium competition.
Pls guide. ( or pls guide how to detect competition level of niche)

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