The stem-and-leaf plot shows the ages of a group of friends. Find the median age.

Question

The stem-and-leaf plot shows the ages of a group of friends. Find the median age.

Stem Leaf
2 8
3 1 2 4
4 2 7 9
5 4
Key: 2|8=28 years

Answer 1

To find the median age, we need to list all the ages in numerical order.

Age list:
28, 31, 32, 34, 42, 47, 49, 54

Since there are 8 ages in total, the median age will be the average of the 4th and 5th values when listed in order.

Median age = (32 + 34) / 2 = 33 years

Therefore, the median age of the group of friends is 33 years.

Answer 2

Here are the math test scores of 10 randomly selected students from Class 1 and Class 2. Class 1: 75 80 84 79 92 86 88 86 86 90 Class 2: 83 85 91 93 72 85 76 80 82 89 Find the mean score of each sample. Based on the mean, which class generally performed better on the math test? (2 points) The mean score for Class 1 is . The mean score for Class 2 is . Based on the mean, Class generally performed better on the math test.