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  3. a salesman normally makes a sale​ (closes)

A salesman normally makes a sale​ (closes) on 75​% of his presentations. Assuming the presentations are​...

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Statistics

A salesman normally makes a sale​ (closes) on 75​% of hispresentations. Assuming the presentations are​ independent, findthe probability of each of the following.

​a) He fails to close for the first time on his fifthattempt.

​b) He closes his first presentation on his fourth attempt.

​c) The first presentation he closes will be on his secondattempt.

​d) The first presentation he closes will be on one of his firstthree attempts.

A manufacturer of game controllers is concerned that itscontroller may be difficult for​ left-handed users. They set out tofind lefties to test. About 13​% of the population is​ left-handed.If they select a sample of 6 customers at random in their​ stores,what is the probability of each of the outcomes described in partsa through f​ below?

a) The first lefty is the fourth person chosen.

The probability is _____________

​(Round to four decimal places as​ needed.)

The probability model below describes the number of repair callsthat an appliance repair shop may receive during an hour. Completeparts a and b below.

Repair Calls 1 2 3 4

Probability .1 .4 .3 .2

​b) What is the standard​ deviation?

The standard deviation is ____________

​(Round to two decimal places as​ needed.)

Answer & Explanation Solved by verified expert
4.0 Ratings (528 Votes)
The probability that the salesman closes on any givenpresentation is p075The probability that the salesman does not close on any givenpresentation is 1p1075025a The probability that he fails to close for the first time onhis fifth attempt is same as the probability that he closes on hisfirst 4 attempts and fails on his 5th attemptans The probability that    See Answer
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