The forth business day of the month

What is the probability that the forth business day of the month is Thursday?(forget about the holidays on weekdays)

This is like asking what is the probability that the first day of the month is Sat, Sun, or Monday. So the answer is 3/7. Many people including me will make the mistake to give answer of 1/5. Notice Monday – Friday are not symmetric because of the non-business day Sat and Sunday.

What is the probability that the forth business day of the month is Monday?

1/7

What is the probability that the forth business day of the month is Tuesday?

1/7

What is the probability that the forth business day of the month is Wednesday?

1/7

What is the probability that the forth business day of the month is Friday?

1/7

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About cgao

Cambridge, MA
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