SOLUTION: A sample of 4 different calculators is randomly selected from a group containing 18 that are defective and 40 that have no defects. What is the probability that at least one of the

Question 1204335: A sample of 4 different calculators is randomly selected from a group containing 18 that are defective and 40 that have no defects. What is the probability that at least one of the calculators is defective?
Answer by ikleyn(52778) (Show Source): You can put this solution on YOUR website!
.


The total set is 40 + 18 = 58 calculators.


The probability that no one of 4 calculators is defective is

     = 0.215405284.



The probability that at least one calculator is defective is the complement to it

    P = 1 -  = 1 - 0.215405284 = 0.784594716.


ANSWER.  The probability that at least one calculator is defective is  0.7846  (rounded).

Solved.

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