Sec 3/4 E Math T14-Q21 - Interpreting a histogram with unequal class widths

Sec 3/4 E Math T14-Q21 - Interpreting a histogram with unequal class widths

Secondary 3
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. Calculate the frequency in the interval \(15<t\le20\).
  3. Find the probability that a randomly selected customer waited more than 20 minutes.

Solution:

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

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