47% of all statistics classes require a statistical calculator and 25% require the use of a computer that has statistical software. of the classes that require a statistical calculator, 19% also require the use of a computer. if a statistics course is selected at random find: (round to 4 decimal places where possible)

a. p(statistical calculator) =

b. p(statistical software) =

c. p(require a statistical calculator and statistical software) =

d. p(require a statistical calculator given require statistical software) =