A newspaper has decided to launch an advertising campaign to attract new subscribers. The goals are to attract at least 1,000 new young (no more than 40 years old) subscribers and to attract at least 2,000 new older (at least 41 years old) subscribers. Suppose the probability of reaching the first goal is 0.6, the probability of reaching the second goal is 0.4, and the probability of reaching both goals is 0.15. Which of the following is true
.a. P(goal 2 is reached, goal 1 isn't) = 0.25

b. P(goal 1 is reached, goal 2 isn't) = 0.45

c. P(neither goal is reached) = 0.15

d. All of these choices are true.

Option D is correct.

All of these choices are true.

Step-by-step explanation:

Let the probability of reaching first goal be P(A)

And probability of reaching second goal be P(B)

P(A) = 0.6

P(B) = 0.4

P(A n B) = 0.15

P(A') = probability that first goal isn't reached = 1 - P(A) = 1 - 0.6 = 0.4

P(B') = probability that second goal isn't reached = 1 - P(B) = 1 - 0.4 = 0.6

P(universal set) = 1

a) Probability that goal 2 is reached, goal 1 isn't = P(A' n B)

P(B) = P(A n B) + P(A' n B)

P(A' n B) = P(B) - P(A n B) = 0.4 - 0.15 = 0.25

P(goal 2 is reached, goal 1 isn't) = 0.25 is correct.

b) Probability that goal 1 is reached, goal 2 isn't = P(A n B')

P(A) = P(A n B) + P(A n B')

P(A n B') = P(A) - P(A n B) = 0.6 - 0.15 = 0.45

P(goal 1 is reached, goal 2 isn't) = 0.45 is correct.

c) Probability that neither goal is reached = P(A' n B')

P(Universal set) = P(A n B') + P(A n B') + P(A n B) + P(A' n B')

1 = 0.45 + 0.25 + 0.15 + P(A' n B')

P(A' n B') = 1 - (0.45 + 0.25 + 0.15) = 1 - 0.85 = 0.15

P(neither goal is reached) = 0.15 is also correct.

the answer is b

saving = more money

step-by-step explanation:

if you have 100 bucks, and you want to buy a candy bar, even if you have one at home, if you choose not to buy it, you save.

~courtney