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To find the median age, we need to arrange the ages in order from least to greatest. The stem-and-leaf plot makes this easy: we can read the ages directly off the plot in order. Here are the ages arranged in order:
28, 31, 32, 34, 42, 47, 49, 54
We have 8 ages, so the median will be the average of the 4th and 5th ages in this ordered list.
Median age: (32+34)/2 = 33
Therefore, the median age of the group of friends is 33 years.