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The following contingency table shows inspection records for 630 units of a particular product. The records have been cross-classified by the inspector’s decision (Pass and Fail) and the inspector’s experience (Low, Medium, and High).
Experience
Decision Low Medium High
Pass 152 287 103
Fail 16 46 26

a.) How many of the units passed inspection? How many of the units failed inspection?

b.) How many of the units were inspected by inspectors with high experience?

c.) What proportion of the units were inspected by inspectors with low experience?

d.) What proportion of the units were inspected by inspectors with medium experience and failed inspection?

 

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