Exploring data: graphs and numerical summaries
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# 5.6.1 Quartiles for the SIRDS data

For the 23 infants who survived SIRDS, the ordered birth weights are given in Table 9. The first quartile is

qL = x (¼(23+1)) = x (6) = 1.720kg.

The third quartile is

qU = x (¾(23+1)) = x (18) = 2.830kg.

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