The following data represents the hours per week worked outside of school by

# The following data represents the hours per week

• Test Prep
• kwin30
• 5
• 80% (5) 4 out of 5 people found this document helpful

This preview shows page 2 - 4 out of 5 pages.

5.The following data represents the hours per week worked outside of school by 200 randomly selected night students at a community college: HoursFrequencyRelative FreqC.R.Freq0-8 20 0.10 0.10 9-16 30 0.15 0.25 17-24 50 0.25 0.50 25-32 60 0.30 0.80 33-40 30 0.15 0.95 41-48 10 0.05 1.00 Total 200 1.00 a)In the space above, determine the relative frequencies and cumulative relative frequencies. b)Sketch a relative frequency histogram, showingallhorizontaland verticallabels. c)Sketch a cumulative relative frequency ogive, showingallhorizontaland verticallabels. d)Estimate the median from the graph. e)What percentage of the night students work 32 hours per week or less? Without calculatingbut explaining your reasoning, which of the following is a reasonable estimate for the standard deviation? 6.Determine if each of the following data are categorical, continuous or discrete (circle one for each) a.Number of fatalities from a tsunami: b.Time spent in traffic: c.Number of Songs on your I-pod: d.Your student number categoricalcontinuousdiscretee.Names of cities in California with a Walmart: f.Price per gallon of gasoline: g. Number of Courses taken in a year. h. Tons of steel used by a manufacturer:
7.1000 students (500 morning, 300 afternoon, 200 night) were asked how often they use the campus library. The results are summarized in the table below: Never uses library Sometimes uses library Frequently uses libray Total Morning 200 250 150 Afternoon 80 145 75 Night 80 10 10 Total 360 405 235 a.Find the following probabilities: i)A randomly selected student never uses the library. 600 300 100 1000