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

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) =

Still stuck? Get 1-on-1 help from an expert tutor now.

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0