A researcher has collected some data on the amount of time in seconds (to the nearest 0.1 second) that it took trained rats to run through a maze. The data is shown below arranged in a frequency distribution of grouped scores. 
The real limits of the interval 6.4-6.7 are _________.
Definitions:
Mental Disorder
A health condition characterized by significant dysfunction in an individual's cognition, emotions, or behavior, often disrupting daily life.
ADHD
Attention Deficit Hyperactivity Disorder, a neurodevelopmental disorder characterized by problems with focus, hyperactivity, and impulsiveness.
M.J. Coldwell
A Canadian politician known for his leadership in the Co-operative Commonwealth Federation and its successor, the New Democratic Party.
Medicare
A federal health insurance program in the United States for people aged 65 and older, and for some younger people with disabilities.
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