Given this histogram, find the number of shoppers in the age group 20−29. (All frequencies graphed to the nearest 5) 
Definitions:
Diagnosis
The process of determining the type of a disease or issue through the analysis of its signs.
Chickenpox
A highly contagious viral infection causing an itchy rash and flu-like symptoms, mainly affecting children.
Varicella
A highly contagious viral disease, also known as chickenpox, marked by a widespread itchy rash.
Vitiligo
A skin condition characterized by patches of skin losing their pigment, resulting in irregular white spots.
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