Originally Posted by

**musicgold**
hi,

can you please review the following text for grammatical and punctuation errors? Thanks. Mg.

i am reading a book that explains the mathematics behind coincidences experienced in our daily lives. In one example, the author __derives ____that__ **posits **the chance that you will at least once experience one of a set of 100 rare events (each with a one-in-million chance of occurring on any day) in a period of 20 years is as high as 52%. I understand this part completely.

what stumps me is the author’s following comment: It means that for every 20 people you know, there is a greater than 50% chance that one of them will have an amazing story to tell during the course of a year.

my questions are:

1. Is the author using the 1 of 20 **phrase to in**dicate a 95% confidence interval (19 out of 20 times)?

2. How the author expects one of a group of 20 to experience a coincidence __in a year’s time__? **do you mean "within a/the year"?**

thanks,

mg