Question 1145365: 1). Based on long-run relative frequencies, approximately 51% of all births in the U.S. are boys. Assume independence.
(a) If a woman has 3 children, find the probability that she has exactly 1 boy.
(b) If a woman has 3 children, find the probability that she has 1 or more boys.
2). A slot machine has 3 wheels. Each wheel has 10 symbols, and each symbol is equally likely when the wheel is spun (assume the wheels act independently of each other). The middle wheel has 1 bell among its 10 symbols, while the left and right wheels have 4 bells each.
(a) You win the jackpot if the wheels show all bells. What is the probability of winning the jackpot on any given spin?
(b) Find the probability of obtaining exactly 2 bells on any given spin.
(c) What is the probability that you get a bell on the first wheel or third wheel?
3). Worldwide, approximately 70% of smart phones run the Android operating system (A) while 30% run a non-Android operating system (A). Suppose 2 smart phones are randomly selected (assume independence).
(a) Determine the probability that the first runs Android (A1) or the second runs Android (A2).
(b) Determine the probability that exactly 1 runs Android
Answer by ikleyn(52803)   (Show Source):
You can put this solution on YOUR website! .
One and only one problem per post.
It is THE RULE and THE POLICY of this forum.
Please obey this rule.
Those who violate it, work against themselves.
With it, welcome to the forum (!)
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