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Parkinson’s Disease. Parkinson’s disease affects internally generated movements such as movements recalled from memory. L-Dopa is a drug that is used in clinical treatment of Parkinson’s disease. In the article, “L-Dopa Induces Under-DampedVisually Guided Motor Responses in Parkinson’s Disease” (Experimental Brain Research, Vol. 202, Issue 3, pp. 553–559), Wing-Lok Au et al. explore the effects of L-Dopa on patients with Parkinson’s disease. Following is a stem-and-leaf diagram of the ages, in years, at which a sample of 14 patients experienced the onset of symptoms of Parkinson’s disease.
How many of these 14 patients were
a. under 45 years old at the onset of symptoms?
b. at least 65 years old at the onset of symptoms?
c. between 50 years old and 64 years old, inclusive, at the onset of symptoms?
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