Arrival-time probabilities and expectation

Arrival-time probabilities and expectation

Secondary 2
4 marks
TGM Original Questions

The probabilities that Mei arrives before and after 7:45 a.m. are \(\frac{5}{12}\) and \(\frac{1}{4}\), respectively.

  1. Find the probability that she arrives exactly at 7:45 a.m.[2]
  2. Over 160 school days, estimate how many days she is not late.[2]

Solution:

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Answer:(a) \(\frac{1}{3}\) (b) \(120\) days.

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