In Chapter 13 of "The Story of My Life," the statements that accurately describe Helen Keller's purpose are:
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to explain the process by which a deaf and blind person could learn to speak - She discusses her experiences and the techniques used to help her learn to communicate.
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to describe how her life changed as she gained the ability to speak - She reflects on how her newfound ability to speak transformed her life and interactions with others.
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to persuade readers that it is important to be patient and to educate every child, despite the challenges - Keller advocates for the importance of education and patience in teaching children with disabilities.
The statement to amuse readers with stories of overcoming challenges is not a primary purpose in this chapter. Instead, Keller focuses more on the educational aspects and her personal experiences.