1 the probability that Luis will pass his statistics test is 0.65. find the prob

Question

1 the probability that Luis will pass his statistics test is 0.65. find the probailty that he will fail his statistics test. express as a decimal

2 In a poll, respondents were asked whether they had ever beenin a car accident. 471 respondents indicated that they had been ina car accident and 420 respondents said that they had not been in acar accident. If one of these respondents is randomly selected,what is the probability of getting someone who has been in a caraccident?

3 A sample of 4 different calculators is randomly selected from a group containing 47 that are defective and 27 that have no defects. What is the probability that all 4 calculators selected are defective ? Assume that the next person selection is made with out replacement  .

. please explain step by step solution

Explanation / Answer

1. p(pass)=0.65 thus p(fail)=1-p(pass)=1-0.65=0.35

2. p(card accident)=471/(471+420)=0.52862

3. p(defective)=47/(47+27)=0.635

P( all 4 calculators selected are defective)=p(defective)*p(defective)*p(defective)*p(defective) =(0.635)^4= 0.1626

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