11.- Parkinson’s disease affects internally generated movements such as movements recalled from memory. 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?
11.- Parkinson’s disease affects internally generated movements such as movements recalled from memory. 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?
The stem and leaf plot is given. From the stem and leaf plot first let us find the data set. In the stem and leaf plot , stem part represent the digit at the tenth place and leaf part represent the digit at unit place.
For example.
3 (stem) | 0 9 (leaf)
The data set will be = {30,39}
Now, let us write the dataset from the above stem and leaf plot.
Dataset = {39,48,49,50,52,52,53,53,54,54,62,65,71,71}
a. From the data set we can see only one patient at the onset of symptoms who is under 45 years old.
So, Number of patients at the onset of symptoms = 1
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