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CH makes a popular type of chocolate bar The bars are made on a production line and are scanned for size and shape as they move along the line Wrong sized and misshapen bars are rejected as being poor quality. The scanner detects 90% of poor quality bars. If CH wants to reduce the risk of poor quality bars being sold to the public it can add a further check by a person scanning the production line as well. this check would detect 80% of poor quality bars
If the further check was implemented what percentage of poor quality bars would still get through the checking process?
Suggested Answer: A, B, D
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28 comments · newest first
VI
Vicki
12 months ago
Surprised that 10% could still slip through after two checks!
RA
Rasheeda
12 months ago
I disagree, I think it's more like 10%.
JO
Joanna
1 year ago
I think the answer is 7.2%, right?
ST
Stephen
1 year ago
Wait, so if they add a person, it only catches 80%? That seems off.
TA
Tawny
1 year ago
The scanner catches 90% of poor bars, that's pretty good!
CH
Chaya
1 year ago
I think I might have the answer, but I’m a bit confused about how to combine the detection rates. Is it really just multiplying the percentages?
AM
Amie
1 year ago
If the first check catches 90%, then 10% get through. But then the second check only catches 80% of the remaining, right?
JE
Jennie
1 year ago
This reminds me of a similar question we did in class about quality control. I think we need to calculate the percentage of bars that pass both checks.
SE
Serita
1 year ago
I remember something about calculating the percentage of errors after multiple checks, but I'm not sure how to apply it here.
AL
Allene
1 year ago
Multiple steps can receive data from the input step, that much I'm sure of. But I'm not certain about the timing - whether it's as soon as it's available or after the full fetch. I'll have to think it through.
VA
Vanda
1 year ago
This seems like a straightforward customer service question. I'd go with B - managing customer expectations is key to building an effective relationship.
AN
Annmarie
1 year ago
I think the ON DELETE CASCADE means that if you delete a parent, the children get deleted too, right? It's something like option A, I believe.
EV
Evangelina
1 year ago
Ugh, these probability questions always make my head spin. But I'm pretty sure the answer is B) 10%.
SE
Sena
1 year ago
So only 10% of poor quality bars would get through the checking process.
SH
Shaniqua
1 year ago
That makes sense, the further check would catch 80% of the remaining 10%.
PA
Paola
1 year ago
I think you're right, the answer is B) 10%.
GE
Gerald
1 year ago
Ha! I bet the people who made this question thought they were being sneaky. But I'm on to them - it's gotta be B) 10%.
NI
Nieves
1 year ago
I'm not sure, but I'll go with B) 10% too.
MI
Michel
1 year ago
Yeah, I agree. The question seems tricky, but B) 10% makes the most sense.
EL
Elsa
1 year ago
I think you're right, it has to be B) 10%.
AL
Alex
1 year ago
If the scanner catches 90% and the manual check catches 80% of the poor quality bars, then the remaining 10% and 20% would still get through, right? I'm going with B) 10%.
SH
Sherman
2 years ago
Hmm, this is a tricky one. I'll need to think it through carefully.
ES
Estrella
2 years ago
Yes, that's true. The scanner detects 90% and the person detects 80%, so some might still slip through.
JE
Jeniffer
2 years ago
But wouldn't some poor quality bars still get through even with the additional check?
ES
Estrella
2 years ago
I think adding a person to scan the production line is a good idea.
IL
Iluminada
2 years ago
Yes, that's true. The scanner detects 90% and the person detects 80%, so some might still slip through.
CA
Carma
2 years ago
But wouldn't some poor quality bars still get through even with the additional check?
IL
Iluminada
2 years ago
I think adding a person to scan the production line is a good idea.