In a group of 20 batteries, 3 are dead. You choose 2 batteries at random. a) Create a probability model for the number of good batteries you get. b) What's the expected number of good ones you get? c) What's the standard deviation?
In a group of 20 batteries, 3 are dead. You choose 2 batteries at random. a) Create a probability model for the number of good batteries you get. b) What's the expected number of good ones you get? c) What's the standard deviation?
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
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Transcribed Image Text:In a group of 20 batteries, 3 are dead. You choose 2 batteries at random.
a) Create a probability model for the number of good batteries you get.
b) What's the expected number of good ones you get?
c) What's the standard deviation?
a) Create a probability model.
Number good
P(Number good)
(Round to three decimal places as needed.)
b) The expected number of good batteries is
(Round to two decimal places as needed.)
c) The standard deviation is.
(Round to two decimal places as needed.)
Enter your answer in each of the answer boxes.
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