probability
posted by kelly on .
hi i really need help on how to solve these two problems, thank you so much!!!
the manager of a local bank observes how long it takes a customer to complete his transactions at the automatic bank teller.
a. describe an appropriate sample space for this experiment.
b. describe the event that it takes a customer between 2 and 3 minutes to complete his transactions.
2. what is the probability that a roulette ball will come to rest on an even number other than 0 or 00? (assume that there are 38 equally likely outcomes consisting of the numbers 136, 0, and 00)?

your first question is too vague for me
#2. There are 18 even numbers
so the prob(even) = 18/38 = 9/19
(note there would also be 18 odd numbers, for a prob(odd) = 9/19
but 9/19 + 9/19 = 18/19 which is not 1.
I once played this for about 1/2 hour by putting a chip on evens and a chip on odds. My win on one of them covered the loss on the other.
So I was breaking even for quite a while, and received free drinks while playing, until the 00 came up, at which point I lost both chips and quit. )