Probability 80856

The probability of occurrence of a certain phenomenon is the same in all trials and is equal to 0.7. Attempts are repeated until this phenomenon occurs. What is the probability that we will have to make a fifth trial?

Correct answer:

p =  0.0284

Step-by-step explanation:

p1=0.7 p2=(12)p11(1p1)21=(12)0.71(10.7)21=20.710.31=5021=0.42 p3=(13)p11(1p1)31=(13)0.71(10.7)31=30.710.32=1000189=0.189 p4=(14)p11(1p1)41=(14)0.71(10.7)41=40.710.33=2500189=0.0756 p5=(15)p11(1p1)51=(15)0.71(10.7)51=50.710.340.0284  p=p5=0.0284



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