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