Question

A sample of 4 different calculators is randomly selected from a group containing 14 that are defective and 34 that have no defects. What is the probability that a sample of four calculators from this batch will contain no defective calculators

Answer 1

below

Explanation:

P (at least one defective) = 1 - P(all calculators work)

=

1

−

(

30

46

×

29

45

×

28

44

×

27

43

)

=

1

−

1827

10879

=

9052

10879

≈

0.832