Question

Suppose a bank? branch, located in a residential? area, is concerned with its service during the? noon-to-1 pm lunch hour. The waiting? times, in? minutes, collected from a sample of 15 customers during this? hour, are listed below. Complete parts? (a) through? (d) below.

9.58 5.94 8.05 5.82 8.77 3.91 8.11 8.42 10.56 6.72 5.73 4.14 6.23 9.86 5.41

**a.** Compute the mean and median.

The mean is

?(Round to two decimal places as? needed.)

The median is

?(Type an integer or a? decimal.)

**b.** Compute the? variance, standard? deviation,
range, coefficient of? variation, and Z scores. Are there any?
outliers? Explain.

The variance is

nothing.

?(Round to three decimal places as? needed.)

Answer #1

Z score is computed as,

X | |

9.58 | 1.1767554 |

5.94 | -0.5859564 |

8.05 | 0.4358354 |

5.82 | -0.6440678 |

8.77 | 0.7845036 |

3.91 | -1.5690073 |

8.11 | 0.4648910 |

8.42 | 0.6150121 |

10.56 | 1.6513317 |

6.72 | -0.2082324 |

5.73 | -0.6876513 |

4.14 | -1.4576271 |

6.23 | -0.4455206 |

9.86 | 1.3123487 |

5.41 | -0.8426150 |

From the above boxplot, we can say that there is no outlier.

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