Homework: Chapter 6 homework Save Score: 0 of 13 pts 2 of 4 (0 complete) HW Scor

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Homework: Chapter 6 homework Save Score: 0 of 13 pts 2 of 4 (0 complete) HW Score: 0%, 0 of 50 pts 6.1.43 Question Help * ing A salesman normally makes a sale closes on 75% of his presentations. Assuming the presentations are independent, find the probabl y of each of the fol a) He fails to close for the first time on his fourth attempt b) He closes his first presentation on his third attempt. c) The first presentation he closes will be on his second attempt d) The first presentation he closes will be on one of his first three attempts. a) The probability he fails to close for the first time on his fourth attempt is Round to four decimal places as needed) Enter your ansver in the answer box and then click Check Answer tieck An parts

Explanation / Answer

Given Probability of closing P=0.75

Probability of non closing q= 0.25

Let X be the number of attempt required to fail to close on first time.

hence X is geometric random variable with parameter q=0.25

a) Hence the probability that he fails to close on fourth attempt is given by

P(X=4)=0.1055 ### by using r command>dgeom(3,0.25)

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