Answer:
Step-by-step explanation:
Hello!
I'll express all the given percentages as probabilities:
Given the events:
Banking online (Bo)
Under the age of 50 (<50)
P(Bo)= 0.30
P(<50)= 0.40
P(Bo ∩ <50)= 0.25
1) What percentage of adults do not conduct their banking online?
The event "adults that do not conduct their baking online" is the complement of the event "adults that conduct their baking online" Symbolically 
P(
)= 1 - P(Bo)= 1 - 0.30 = 0.70
2) What type of probability is 25%?
The probability P(Bo ∩ <50)= 0.25 is a joint probability, it indicates the intersection between both events.
3) Construct a contingency table showing all joint and marginal probabilities.
Check attachment.
4) What is the probability that an individual conducts banking online given that the individual is under the age of 50?
Symbolically:
P(Bo/<50)= <u> P(Bo ∩ <50) </u> = <u> 0.25 </u> = 0.625
P(<50) 0.40
I hope it helps!
I don’t bro cuz I need help to
Answer: B. Being around cigarette smokers and developing heart disease .
C. Independent. Being around cigarette smokers does not cause heart disease.
Step-by-step explanation:
Given : A study found that there is no relationship between being around cigarette smokers and developing heart disease.
i.e. The two events here are Being around cigarette smokers and developing heart disease .
Since there is no relationship between the above two events.
Being around cigarette smokers does not cause heart disease.
It means that the two events are not dependent on each other i.e. they are independent.