Question

this shows how many baseball cards a group of friends have in their collections. how many friends have baseball card collections with more than 70 cards?

Explanation:

Step1: Identify relevant rows

Look at rows with stem 7, 8, 9, 10 in stem - and - leaf plot.

Step2: Count data points

For stem 7, there are 4 data points (72, 72, 75, 70). For stem 8, there are 3 data points (81, 84, 88). For stem 10, there is 1 data point (106). There are no data points for stem 9. So in total, 4 + 3+ 1=8.

Answer:

8