Wireless sets are manufactured with 25 soldered joints each on the average 1 joint in 500 defective. How many sets can be expected to be free from defective joints in a consignment of 10,000 sets.
Solution;
On average,1 in 500 joints s defective;
Number of soldered joints,n=25
Probability that a joint is defective=
Therefore;
Apply Poisson distribution;
P(there are r defective joints)=
Hence;
Hence the expected number of free sheets from 10,000 sets is;
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