If it is a known fact that 13% of all residential phone numbers are unlisted and you randomly select 100 numbers from the phone book, how many of the 100 do you expect to be unlisted?
2007-05-15 22:22:57 · 7 answers · asked by zedzo 1 in Science & Mathematics ➔ Mathematics
None, because they are listed as they're in the phone book which you get them from. Nice try.
2007-05-15 22:27:36 · answer #1 · answered by Anonymous · 0⤊ 0⤋
1
2016-12-24 20:23:55 · answer #2 · answered by Anonymous · 0⤊ 0⤋
It would depend on a whole load of other statistics that you haven't provided. How old is the phone book? What is the rate at which previously listed subscribers opt to become unlisted, what is the rate at which numbers change?
2007-05-15 23:06:18 · answer #3 · answered by Anonymous · 1⤊ 0⤋
If they are unlisted they wouldn't be in the phone book so the answer is 0.
2007-05-15 22:29:13 · answer #4 · answered by ELofty 2 · 0⤊ 0⤋
2
2017-03-08 21:11:54 · answer #5 · answered by ? 3 · 0⤊ 0⤋
none
Unlisted numbers are not in the phonebook
Nice try!
2007-05-16 00:28:01 · answer #6 · answered by stevmg 3 · 0⤊ 0⤋
well, duh... none cos u're getting them from the phone book
2007-05-15 22:37:13 · answer #7 · answered by tut_einstein 2 · 0⤊ 0⤋