Answer:
mean = 24
Explanation:
In a stem-and-leaf plot, each leaf represents a number or piece of data.
Each the leaf will only show the last digit of the number, and the stem will have the rest.
Examples:
stem value of 1 with a leaf value of 2 = 12
a stem value of 3 with a leaf value of 0 = 30
So, this is your plot:
Stems| Leaves
1 | 2 3 5
2 | 8 8
3 | 0
4 | 2
Your data is 12, 13, 15, 28, 28, 30, 42.
Add up all these numbers and divide by the number of leaves.
Sum of data = 12 + 13 + 15 + 28 + 28 + 30 + 42 = 168
Number of leaves = 7
168 ÷ 7 = 24
∴ The mean is the values in the stem-and-leaf plot is 24.