The Life Starter
Sign up
Grade 12 · unit review

Review: Compare Systems under Explicit Constraints

Compare a model with 40 tasks at 8 tasks/s, latency samples[1,1,1,1,8]seconds and a 50 Wdevice used 4 hours. Report duration,mean,max and bounded energy.

Download reviews and answer keys

Bring the unit skills together

Use these 4 new cases to check your reasoning. Choices are temporary and are not saved to an account, sent to staff or recorded as school grades. Download your current review choices before leaving or reloading.

Unit review questions
1. Ideal model completes 12 tasks per second. Duration for 72 tasks, excluding setup and contention?
Need a hint?
  • Divide total tasks by the stated constant throughput using matching time units.
  • A high average throughput does not guarantee every individual request has low latency.
2. Paper Python 3 expression: max([4,4,5,4,15]). What value results?
Need a hint?
  • Compare the maximum recorded latency with the average rather than replacing one measure with the other.
  • The maximum in five samples does not certify a production percentile.
3. Constant device power 150 W for 3 hours. Modeled device-only energy in kWh?
Need a hint?
  • Multiply watts by hours and divide by 1000 to express modeled energy in kilowatt-hours.
  • Do not call a device-only estimate the whole service’s lifecycle footprint.
4. OptionF needs a network for its essential task. Required: works offline and supports keyboard tasks. Choose the supplied conclusion.
Need a hint?
  • Eliminate options that fail required constraints, then explain the remaining tradeoff.
  • The smallest single number does not automatically identify the best overall system.

The download contains your current choices and any checked feedback. Keep the separate transfer-task work in your own document; downloading its instructions does not mark it complete.

Use the skills in a new task

Compare a model with 40 tasks at 8 tasks/s, latency samples[1,1,1,1,8]seconds and a 50 Wdevice used 4 hours. Report duration,mean,max and bounded energy.

Work on paper or in your own document. Explain the choices you made.

  • Use only supplied fictional inputs and state the relevant rule.
  • Include labeled steps or evidence for each decision.
  • Name one limitation or tempting mistake.
  • Check that the result meets the task and revise a justified error.
Compare with a model response

Duration is 40/8=5 seconds. Mean latency is 12/5=2.4 seconds while maximum is 8 seconds. Device-only energy is 50×4/1000=0.2 kWh. These measures answer different questions and exclude wider service overhead.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.