There are 1 cashew and 3 pistachios in a bag. You take one nut out at random and eat it, and repeat this until you get a cashew. Let X be the number of nuts you had to take in order to get a cashew. For example, if you took out a pistachio, another pistachio, and then a cashew, X would be 3. Find the expected value of X. (A) 1 (B) 2 (C) 5 (D) 2 (E) ¼ (F) ½ (G) % (H) %

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 68E
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There are 1 cashew and 3 pistachios in a bag. You take one nut out at random and
eat it, and repeat this until you get a cashew. Let X be the number of nuts you had
to take in order to get a cashew. For example, if you took out a pistachio, another
pistachio, and then a cashew, X would be 3. Find the expected value of X.
(A) 1
(В) 7,
(С) 5
(D) 2
(E)
(F) ½
(G) %
(H) ½
Transcribed Image Text:There are 1 cashew and 3 pistachios in a bag. You take one nut out at random and eat it, and repeat this until you get a cashew. Let X be the number of nuts you had to take in order to get a cashew. For example, if you took out a pistachio, another pistachio, and then a cashew, X would be 3. Find the expected value of X. (A) 1 (В) 7, (С) 5 (D) 2 (E) (F) ½ (G) % (H) ½
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