What is the answer,to the correct number of significant figures,of the following calculation? 
Definitions:
Autism Spectrum Disorders
A range of developmental disorders characterized by challenges with social skills, repetitive behaviors, and communication difficulties.
Apparent Until
A phrase indicating that something is clearly observed or understood up until a certain point.
Kindergarten
An educational environment or class for young children, typically ages 4-6, that focuses on playing, singing, practical activities, and social interaction as a foundation for learning.
Rett's Disorder
A rare genetic neurological disorder that primarily affects females, leading to severe impairments in language, coordination, and repetitive movements.
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