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Question 21 Not yet answered Points out of 4.00 Flag question The pro ability of a single radar station detecting an enemy plane is 06. How many such stations are required to be 97% certain that an enemy plane detected by at least one station? ying over will be Select one: o a. 3 o b. 2 C. 4 e. none of these choices
math   Statistics-And-Probability   
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Answer #1

let number of stations =n

therefore probability that enemy plane is detected by at least one station=1-(0.4)n >=0.97

(0.4)n <=0.03

taking log and solving:

n>=ln(0.03)/ln(0.4)

n>=3.82

n=4

option C is correct

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