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## Probabilistic and Statistical Techniques

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**Probabilistic and Statistical Techniques**Lecture 7Eng. Heba Hamad2008 Lecture 7**Probabilistic and Statistical Techniques**Chapter 2 Revision Lecture 7**Probabilistic and Statistical Techniques**Exercise 1 Fine mean, median, mode, midrange Lecture 7**Probabilistic and Statistical Techniques**Solution Lecture 7**Probabilistic and Statistical Techniques**Exercise 2 Fine Standard deviation, variance for each of the two sample Lecture 7**Probabilistic and Statistical Techniques**Lecture 7**Probabilistic and Statistical Techniques**Exercise 3 Lecture 7**Probabilistic and Statistical Techniques**Exercise 4 Fine the indicated quartile or percentile a) Q1, b) Q3, c) P80, d) P33 Lecture 7**Probabilistic and Statistical Techniques**Exercise 5 The given values are the services times (in seconds) of McDonalds drive - through customers. McDonalds want to maintain a mean of a 90 sec or less. Did they succeed ? 88 107 35 93 65 55 119 83 99 74 46 108 Lecture 7**Probabilistic and Statistical Techniques**Probabilistic and Statistical Techniques Exercise 6 The following frequency table describes the speeds of drivers ticketed by some town police. These drivers were traveling through a 30 mi/h speed zone on the road. How does the mean comparing to the posted speed limit of 30mi/h Lecture 7**Probabilistic and Statistical Techniques**Exercise 7 The test score in a statistics class have a mean of 75 and a standard deviation of 12. use the range rule of thumb to estimate the minimum and maximum usual scores. Is a score of 50 considered unusual in this context ? Lecture 7**Probabilistic and Statistical Techniques**Exercise 8 What do you know about the values in a data set having a standard deviation of s = 0 ? Lecture 7**Probabilistic and Statistical Techniques**Exercise 9 A small business consultant is investing the performance of several companies. The sales for the selected companies were: Lecture 7**Probabilistic and Statistical Techniques**Exercise 9 continued The consultant wants to include a chart in his report comparing the sales of the six companies. Use bar chart to compare the sales of these companies. Lecture 7**Probabilistic and Statistical Techniques**Exercise 9 continued Lecture 7**Probabilistic and Statistical Techniques**Exercise 10 A headline in a Toledo, Ohio, newspaper reported that crime was on the decline. Listed below are the no. of homicides from 1986 to 2002. draw a line chart to summarize the data of the homicide rates for the last 17 years. Lecture 7**Probabilistic and Statistical Techniques**Exercise 10continued Lecture 7**Probabilistic and Statistical Techniques**• Exercise 11 • The Apollo space program lasted from 1967 until 1972 and included 13 missions. The missions lasted from as little as 7 hours as long as 301 hours. The duration of each flight is listed below: • 195 241 301 216 260 7 244 192 147 10 295 142 • Find the mean and median of the flight times • Find the range and the standard deviation of the flight times Lecture 7