In the town of maplewood a certain type of dvd player is sold at just two stores, 43% of the sales 13) are from store a and 57% of the sales are from store b. 2.4% of the dvd players sold at store a are defective while 4.0% of the dvd players sold at store b are defective. if kate receives one of these dvd players as a gift and finds that it is defective, what is the probability that it came from store a?
a) 0.312
b) 0.453
c) 0.688
d) 0.024

Option A 0.312 is right

Step-by-step explanation:

Given that iN Maplewood a certain type of DVD player is sold at just two stores, 43% of the sales 13) are from store A and 57% of the sales are from store B. 2.4% of the DVD players sold at store A are defective while 4.0% of the DVD players sold at store B are defective.

Prob for any random item form store to be defective = Prob from A and defective +Prob from B and defective

=

Prob it came from A and defective = 0.

If Kate receives one of these DVD players as a gift and finds that it is defective, what is the probability that it came from store A

=

(1,4) is on graph of f(x)

f(1) = 4

so 1/4 f(x)

1/4 f(1)

1/4. ×4

1

so point for function 1/4. f(x) is (1,1)