Answer:
A. P = 0.73
B. P(A∩B∩C') = 0.22
C. P(B/A) = 0.5
P(A/B) = 0.75
D. P(A∩B/C) = 0.4
E. P(A∪B/C) = 0.85
Step-by-step explanation:
Let's call A the event that a student has a Visa card, B the event that a student has a MasterCard and C the event that a student has a American Express card. Additionally, let's call A' the event that a student hasn't a Visa card, B' the event that a student hasn't a MasterCard and C the event that a student hasn't a American Express card.
Then, with the given probabilities we can find the following probabilities:
P(A∩B∩C') = P(A∩B) - P(A∩B∩C) = 0.3 - 0.08 = 0.22
Where P(A∩B∩C') is the probability that a student has a Visa card and a Master Card but doesn't have a American Express, P(A∩B) is the probability that a student has a has a Visa card and a MasterCard and P(A∩B∩C) is the probability that a student has a Visa card, a MasterCard and a American Express card. At the same way, we can find:
P(A∩C∩B') = P(A∩C) - P(A∩B∩C) = 0.15 - 0.08 = 0.07
P(B∩C∩A') = P(B∩C) - P(A∩B∩C) = 0.1 - 0.08 = 0.02
P(A∩B'∩C') = P(A) - P(A∩B∩C') - P(A∩C∩B') - P(A∩B∩C)
= 0.6 - 0.22 - 0.07 - 0.08 = 0.23
P(B∩A'∩C') = P(B) - P(A∩B∩C') - P(B∩C∩A') - P(A∩B∩C)
= 0.4 - 0.22 - 0.02 - 0.08 = 0.08
P(C∩A'∩A') = P(C) - P(A∩C∩B') - P(B∩C∩A') - P(A∩B∩C)
= 0.2 - 0.07 - 0.02 - 0.08 = 0.03
A. the probability that the selected student has at least one of the three types of cards is calculated as:
P = P(A∩B∩C) + P(A∩B∩C') + P(A∩C∩B') + P(B∩C∩A') + P(A∩B'∩C') +
P(B∩A'∩C') + P(C∩A'∩A')
P = 0.08 + 0.22 + 0.07 + 0.02 + 0.23 + 0.08 + 0.03 = 0.73
B. The probability that the selected student has both a Visa card and a MasterCard but not an American Express card can be written as P(A∩B∩C') and it is equal to 0.22
C. P(B/A) is the probability that a student has a MasterCard given that he has a Visa Card. it is calculated as:
P(B/A) = P(A∩B)/P(A)
So, replacing values, we get:
P(B/A) = 0.3/0.6 = 0.5
At the same way, P(A/B) is the probability that a student has a Visa Card given that he has a MasterCard. it is calculated as:
P(A/B) = P(A∩B)/P(B) = 0.3/0.4 = 0.75
D. If a selected student has an American Express card, the probability that she or he also has both a Visa card and a MasterCard is written as P(A∩B/C), so it is calculated as:
P(A∩B/C) = P(A∩B∩C)/P(C) = 0.08/0.2 = 0.4
E. If a the selected student has an American Express card, the probability that she or he has at least one of the other two types of cards is written as P(A∪B/C) and it is calculated as:
P(A∪B/C) = P(A∪B∩C)/P(C)
Where P(A∪B∩C) = P(A∩B∩C)+P(B∩C∩A')+P(A∩C∩B')
So, P(A∪B∩C) = 0.08 + 0.07 + 0.02 = 0.17
Finally, P(A∪B/C) is:
P(A∪B/C) = 0.17/0.2 =0.85
