What are possible blood types (neglect positive and negative)

O negative, O positive, A negative, A positive, B negative, B positive, AB negative, and AB positive

Blood Type Frequency (U. S. population)

O Positive blood - 37%

O Negative blood - 7%

A Positive blood - 36%

A Negative blood - 6%

B Positive blood - 8%

B Negative blood - 2%

AB Positive blood - 3%

AB Negative blood - 1%