If 85% of breast cancer cases occur in women with no family history, what percentage have a family history?

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Multiple Choice

If 85% of breast cancer cases occur in women with no family history, what percentage have a family history?

The main idea is using a simple complement. If 85% of breast cancer cases occur in women with no family history, the remaining portion must come from those with a family history. Percentages add up to 100%, so subtract: 100% − 85% = 15%. Therefore, 15% have a family history. This reflects that while family history is a risk factor, most cases occur in women without one. The other options would conflict with the given 85% who have no family history.

The main idea is using a simple complement. If 85% of breast cancer cases occur in women with no family history, the remaining portion must come from those with a family history. Percentages add up to 100%, so subtract: 100% − 85% = 15%. Therefore, 15% have a family history. This reflects that while family history is a risk factor, most cases occur in women without one. The other options would conflict with the given 85% who have no family history.

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