Final answer:
To calculate the average number of cavities in Dr. D's patients, sum up the cavity numbers and divide by the number of observations. The average is approximately 2.85.
Step-by-step explanation:
To find the average number of cavities that Dr. D's patients have, we need to add up all the cavity numbers from the data set and then divide by the total number of observations in the data set. The data given is 1, 0, 1, 5, 6, 3, 4.
- Add all the numbers together: 1 + 0 + 1 + 5 + 6 + 3 + 4 = 20.
- Count the number of observations: There are 7 numbers in the data set.
- Divide the sum by the total number of observations to get the average: 20 ÷ 7 ≈ 2.85.
Therefore, the average number of cavities Dr. D's patients have is approximately 2.85.