The sample size is: _____

The percentage of persons who commute for less than 30 minutes, rounded to two decimal places, is: _____

The cumulative relative frequency of the fourth class, rounded to four decimal places, is: _____

The percentage of persons who commute for 40 or more minutes, rounded to two decimal places, is: _____

The percentage of persons who commute for less than 50 minutes, rounded to two decimal places, is: _____

The number of persons who commute for 20 or more minutes is: _____

4.  The temperatures (in degrees Fahrenheit) observed during seven days of summer in Los Angeles are:78    99    68    91    103    75    85

The range of these temperatures is: _____

The variance of these temperatures, rounded to three decimals, is: _____

The standard deviation, rounded to three decimals, of these temperatures is:  _____

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