# Exam1PracticeMath1110Key9_9_19-1.pdf - The Exam 1 Formula...

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The Exam 1 Formula Sheet is placed at the end. 1) We have an urn with 1 red ball and 9 yellow balls. We will sample 3 balls form the urn with replacement. What is the probability that we will obtain at least one yellow ball? a) 0.001 b) 0.9500 c) 0.9999 d) 0.9900 e) 0.9990* 2)An urn contains 3 yellow balls and 9 red balls. We select four balls from the urn with replacement. That is, after each ball is selected the ball is returned to the urn before the next ball is chosen. Find the probability that at least one yellow ball is obtained. a)255/256 b)1023/1024 c)1/1024 d)1/256 e)175/256 * Events We have events A and B so that P(A) = 0.4 and P(B) = 0.5. 3)Referring to Events, find P(AB), if P(AӀB) = 0.30.
No Replacement An urn contains 3 red balls and 7 yellow balls. Suppose we select two balls from the urn without replacement.

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