5. Based on the following confusion matrix with a validation set of 100, class 1 reflects the members targeted who purchased services and class 0 reflects the non-targeted respondents who did not purchase services. Calculate the specificity rate. Actual Class Class 1 Class O A. 62% B. 78% C. 84% D. 84.5% Predicted Class 1 18 11 Predicted Class 0 11 60

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