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Back-of-Envelope Estimation — Series 3
Preview — 3 of 10 questions
A page waits for all 20 independent calls. Each call finishes within 100 ms with probability 0.99. What is the probability that all finish within 100 ms?
AAbout 81.8%.
BAbout 95.0%.
CAbout 99.0%.
DAbout 20.0%.
A pipeline ingests 2 TB/day before compression. Compression halves storage, retention is 30 days, and three full replicas are kept. Ignoring metadata, how much physical storage is needed?
A180 TB.
B90 TB.
C360 TB.
D30 TB.
A storage scheme encodes each object as six data fragments and three parity fragments of equal size. What physical capacity is needed for 60 TB of logical objects, excluding metadata?
A80 TB.
B120 TB.
C90 TB.
D180 TB.
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