Different brands (n= 20) of vaccines were tested to see how long they would to fight virus. The results are follows. Class Boundaries Frequency (months) 6.5-12.5 3 12.5-18.5 18.5-24.5 24.5-30.5 4 30.5-36.5 2

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Q: 64 -32- 16 270-80 64 48-32-1 52-48-64-8090 -16 -48 64- 180 of83-9-8- e-8-9-38-8

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