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# Halfway through the basketball season, a basketball player has hit 78% of her free-throws. What is the probabilty that she will miss her next free-throw?

I need to know the probability of when she will miss her next free throw.

### 4 Answers by Expert Tutors

Arthur D. | Effective Mathematics TutorEffective Mathematics Tutor
5.0 5.0 (9 lesson ratings) (9)
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If you hit 78 % of your free throws, you miss 22 % of your free throws. 22 % of the time you miss !!

The probability is 22 %=22/100=11/50.
Charles B. | Math made easy! Teaching Math, SAT and Science since 1995.Math made easy! Teaching Math, SAT and S...
5.0 5.0 (34 lesson ratings) (34)
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This is a trick question.

If you aren't told what the expected probability of her free-throws is, there's no way to tell.

For example, if you flip a fair coin 3 times and it comes up heads all three times, that has no effect on the next flip. It's not "more likely" to be Tails, which is why the Basketball player in the problem's NEXT free throw doesn't depend on her other free throws earlier in the season.

I suspect it's a poorly-written problem, in which case Pran's answer of 0.22 is correct. :-)
Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
3.0 3.0 (1 lesson ratings) (1)
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Hi Brittany;
We need to know the quantity of games she has played.

Pran D. | California certified high school teacher in math and physicsCalifornia certified high school teacher...
5.0 5.0 (37 lesson ratings) (37)
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probability of miss is 1 minus .78 = 0.22