Final answer:
Women in their 40s have the greatest odds of being diagnosed with breast cancer.
Step-by-step explanation:
The age group of women with the greatest odds of being diagnosed with breast cancer is in their 40s. According to the provided information, the percentage of women diagnosed in each age group is as follows:
- 20-30: 75%
- 31-40: 26.5%
- 41-50: 13.6%
- 51-60: 21.9%
- 61-70: 21%
From these percentages, we can see that the highest percentage occurs in the 40s, making it the age group with the greatest odds of being diagnosed with breast cancer.