Question 613347
P(E U F) = P(E) + P(F) - P(E intersect F)


P(E U F) = P(E) + P(F) - P(E)*P(F)  <font color="blue">****</font> See <font color="blue">note</font> below <font color="blue">****</font>


P(E U F) = 0.3 + 0.8 - 0.3*0.8


P(E U F) = 0.3 + 0.8 - 0.24


P(E U F) = 1.1 - 0.24


P(E U F) = <font color="red">0.86</font>



<font color="blue">**** Note </font>: Since "E & F are independent events", we can say P(E intersect F) = P(E)*P(F) <font color="blue">****</font>