Asked by pam

a sameple of 137 firecrackers contained 6 duds. how many duds would you expect in a sample of 2466 firecrackers?
Answered by Knights
Honestly, it is neither beneficial to any of us for you to continually post so many questions without an explanation of what you need.

Anyways,

137 / 6 = firecrackers / duds

137/6 = 2466/x = firecrackers / duds

137/6 = 2466/x

cross multiply to get

137x = 2466*6

x = 108

so you would expect 108 duds
Answered by Len
Hold on there knights! Let’s say that the first one tested is a dud. Is it reasonable to stop the testing right there and say every firecracker is a dud? And how confident of that estimation would you be? It would be more helpful to explain how many firecrackers need to be tested in order to be 90% or 95% or 98% sure of your estimate of the dud rate.
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