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Practice Exam 1- BIT 2405 Multiple Choice Part (2.5 points each) I. A radio station claims that the amount of advertising per hour of broadcast time has an average of 5 minutes,
a median of 5 minutes, a mode of 5 minutes, and a standard deviation equal to 1.2 minutes. 1. The distribution of advertising times is 1. Symmetric 2. Skewed right 3. Skewed left 4. Bi-modal 2. What percentage of advertising times amounted to less than 6.2 minutes? a. Approximately all b. Approximately 84% c. Approximately 97.5% d. Approximately 95% 3. Assuming nothing is known about the distribution in the situation above, what percentage of advertising times amounted to less than 2.6 minutes? a. At most 12.5% b. At most 25% c. At most 11% d. None of the above 4. An advertising time is observed that is 8 minutes. Is that unusual? 1. Yes 2. No 3. Don’t Know
II. Following is a sample of Wageweb’s survey data (in $1,000).
Salaries ($1000) 40 51 55 62 71 42 47 57 49 68 43 47 2 xi =632 x i = 34416
5. Approximately wh...

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