Question

(3_4sin²a) (sec²_4tan²a) =(3-tan²a)(1-4sin²a)
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Answer 1

Being male and preferring brand A are independent.

Because: if independent then P(male and brand A) = P(male) P(brand A) = 0.48 * 0.75 = 0.36 and that is true (= value in the table)

P(male|brand A)=0.36/0.75=0.48 = P(male)

So the two answers are:

(1) "independent"

(2) =

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