The pie chart shows how a student spends his 24-hour day. If the sector representing sleep subtends an angle of 120° at the centre, how many hours does the student spend sleeping?
A6 hours
B8 hoursCORRECT
C10 hours
D12 hours
GCEMathematicsStatistics2021
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Why the answer is B, and why the others tempt you.
The fraction of the day spent sleeping is the sector angle divided by 360°. Fraction = 120/360 = 1/3. Hours of sleep = (1/3) × 24 = 8 hours.
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