Assume that the observed relative frequencies are reasonable

Assume that the observed relative frequencies are reasonable estimates of probabilities for the overall WNB population. In addition, define correspond to job classifications. 1 through 6, respectively, and define events X and Y to correspond to \"No\" and \"Yes\" for computer usage following from the table above, indicating your answers rounded to 4 decimal places and including leading zeros as appropriate.

Solution

a). P(Y) = 0.0860

b). P( C and Y) = 0.0230

c). P(C or Y) =0.2040+0.0860-0.0230 =0.2670

d).P( C/Y) =0.0230/0.0860 =0.2674

e). P( C and E) =0.0000

f). P(C or E) = 0.2040+0.1040 =0.3080