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A factory has 2 firms producing the same type of product. The numbers of errors per product produced by firm A and firm B follow
A factory has firms producing the same type of product. The numbers of errors per product
produced by firm A and firm B follow Poisson distributions with means of and respectively.
Furthermore, errors occur independently between products regardless the producing firms.
a Suppose that the proportion of products produced by firm A is In a random sample of
products produced by this factory, find the probability that there are more than products
that have exactly errors.
b In a random sample of products produced by firm A find the probability that there are
from to products that have at least error.
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