We know that n=15 and the success probability in our experiment = 0.3*0.3 = 0.09 X – number of refrigerators replaced during the warranty period Answerįirst let’s define our random variable as follows Suppose, a person buys 15 refrigerators for charity, calculate the probability that 3 refrigerators will be replaced during the warranty period. From this 30%, 70% can be repaired and the remaining 30% should be replaced with new refrigerators. The solution to the first part is as follows ģ0% of all refrigerators require repairs during the warranty period.
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