2026 TPSS P1 Q11

2026 TPSS P1 Q11

Secondary 4
3 marks

The table below shows the time taken by 100 students to complete a hiking trail.

Time (\(t\) minutes)\(30<t\leq40\)\(40<t\leq50\)\(50<t\leq60\)\(60<t\leq70\)\(70<t\leq80\)
Frequency\(15\)\(32\)\(30\)\(16\)\(7\)

Calculate an estimate of the

  1. mean time,[1]
  2. standard deviation of the above times.[2]

Solution:

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Answer:(a) \(51.8\) minutes (b) \(11.2\) minutes

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