Answer:
35.6 minutes
Explanation:
The average (aka mean) of a set of values is defined as the sum of the values divided by the total number of values.
Step 1: Find sum of values:
According to the dot plot: person talked 0 minutes
- 1 person talked 0 minutes,
- 2 people talked 10 minutes
- 2 people talked 20 minutes,
- 4 people talked 30 minutes,
- 3 people talked 50 minutes,
- and 4 people talked 60 minutes,
Now we can find the sum using addition and multiplication:
Sum = (1 * 0) + (2 * 10) + (2 * 20) + (4 * 30) + (3 * 50) + (4 * 60)
Sum = 0 + 20 + 40 + 120 + 150 + 240
Sum = 570
Step 2: Find the total number of values present.
To find the total number of values, we add up the total number of people present:
Total = 1 + 2 + 2 + 4 + 3 + 4
Total = 16
Step 3: Determine average by dividing sum of values by total number of values. Then round to the nearest tenth:
Average = 570 / 16
Average = 35.625
Average = 35.6
Thus, the average number of minutes spent talking on a cell phone was about 35.6 minutes