SOLUTION: You toss a fair coin 4 times. What is the probability that (round to 4 decimal places) a) you get all Heads? b) you get at least one Tail?

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Question 1199637: You toss a fair coin 4 times. What is the probability that (round to 4 decimal places)
a) you get all Heads?

b) you get at least one Tail?

Answer by ikleyn(52847) About Me  (Show Source):
You can put this solution on YOUR website!
.

(a)  1%2F2%5E4 = 1%2F16.



(b)  1 - 1%2F2%5E4 = 1+-+1%2F16 = 15%2F16.    

     Event (b) is the complement to event (a).

Solved.


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Usually, in such problems, decimal presentation of the answer is NOT required,
because the formula presentations demonstrates understanding.

But if your teacher requires decimal presentation, you can do it on your own.


Correct rounding is not the right subject in teaching such problems.


Under the right educational curriculum/paradigm,  correct rounding is a pre-requisite,
which should be elaborate  YEARS  BEFORE  a student starts solving such problems.