5. The following set of data contains the blood types of COVID-19 patients.
A, O, AB, 0, A, O, A, AB, O, O, AB, A, O, A, O, O, AB, A, A, O
How many COVID-19 patients have AB blood type?
A. 4
B. 7
C.9
D. 20
A, O, AB, 0, A, O, A, AB, O, O, AB, A, O, A, O, O, AB, A, A, O
How many COVID-19 patients have AB blood type?
A. 4
B. 7
C.9
D. 20
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