What is the sleep efficiency (rounded to the nearest percentage)?

What is the sleep efficiency (rounded to the nearest percentage)?

• A. 70%
• B. 89%
• C. 76%
• D. 74%

Answer: (C)

Sleep efficiency is the portion of time in bed that you actually spend asleep. It’s calculated by dividing total sleep time by time in bed, then multiplying by 100 to get a percentage, and finally rounding to the nearest whole percent. If you plug in the numbers from the scenario (for example, 6 hours 6 minutes asleep out of 8 hours in bed), you get 6.1 hours ÷ 8 hours = 0.7625, which rounds to 76%. That’s why 76% is the best choice here. The other percentages would require different sleep time or time in bed values and don’t match the rounded result.

Sleep efficiency is the portion of time in bed that you actually spend asleep. It’s calculated by dividing total sleep time by time in bed, then multiplying by 100 to get a percentage, and finally rounding to the nearest whole percent.

If you plug in the numbers from the scenario (for example, 6 hours 6 minutes asleep out of 8 hours in bed), you get 6.1 hours ÷ 8 hours = 0.7625, which rounds to 76%. That’s why 76% is the best choice here. The other percentages would require different sleep time or time in bed values and don’t match the rounded result.