A call centre recorded the duration of each phone call an employee made during a day. The results are shown on the following histogram.

a

Complete the frequency table.

Length of calls (minutes) |
Number of calls |
---|---|

$1$1 | $\editable{}$ |

$2$2 | $\editable{}$ |

$3$3 | $\editable{}$ |

$4$4 | $\editable{}$ |

$5$5 | $\editable{}$ |

$6$6 | $\editable{}$ |

$7$7 | $\editable{}$ |

Total: |
$\editable{}$ |

b

What is the total number of minutes spent on phone calls?

c

What is the probability that a call, chosen at random, has a duration of $7$7 minutes? Give your answer as a percentage correct to two decimal places.

Easy

Approx 6 minutes

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S7-4 Investigate situations that involve elements of chance: A comparing theoretical continuous distributions, such as the normal distribution, with experimental distributions B calculating probabilities, using such tools as two-way tables, tree diagrams, simulations, and technology.

Apply probability methods in solving problems