Determine the valence intensity of the following tweet, considering the mental state of the author. Assign a real number between 0 and 1, where 0 denotes extremely negative and 1 denotes extremely positive.
Tweet: ACT 4 #anxiety &amp; #depression group. @livingwellihc beginning Mon October 17 for 6 weeks. Contact me to register now! #mindfulness #Halifax
0.533