The probability of a girl getting a line busy every time when she calls is 1/3 and if she makes one call on each of 4 consecutive days, then
A: Probability of getting the line busy on each of the 4 days
B: 1/4
C: A and B are equal
D: It's not possible to answer
[My Solution]
Since each days is a separate Possible Outcome which is 1/3 and she calls one time each day, then on each of the days the probability that she gets the line busy is 1/3
Is that true? Thank you
Yes, often the wording of the question is a little ambiguous
when it comes to probabilities.
Each day she has a 1/3 chance of getting a busy signal.
Also, can you double-check the entire question as A should have a choice rather than the statement given.
I would interpret the question (which is placed in the A option position (!)) as "all four days",
in which case you'd use a "power of 4".
Then again, the question may be asking for the seperate probabilities on each day,
which is the answer you've given (!)