Sec 3/4 E Math Mock 1-Q23 - Mock Paper 1: Interpreting a histogram with unequal class widths

Sec 3/4 E Math Mock 1-Q23 - Mock Paper 1: Interpreting a histogram with unequal class widths

Secondary 3
6 marks
Original parallel to Sec3&4 E Math FA

The histogram represents the waiting times, in minutes, of 68 customers.

  1. State the class interval with the greatest frequency density.[2]
  2. Calculate the frequency in the interval \(15<t\le20\).[2]
  3. Find the probability that a randomly selected customer waited more than 20 minutes.[2]

Solution:

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Answer:(a) \(0<t\le5\); (b) \(18\); (c) \(\frac{4}{17}\).

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