nationwide at selected roadway locations. Each time a motorcyclist passed by the observer noted whether the rider was wearing no helmet, a noncompliant helmet, or a compliant helmet. Using the coding
noncompliant helmet
compliant helmet
helmet
a few of the observations were
There were also additional observations, which we didn't reproduce here. In total, there were riders who wore no helmet, who wore a noncompliant helmet, and who wore a compliant helmet.
The corresponding frequency distribution is given in the table below. Round relative frequencies to three decimal places.
tableHelmet Use Category,Frequency,Relative FrequencyNo helmet,,larrNoncompliant helmet,Compliant helmet,,TotaltableuarrTotal numberof observationstableShould total but in some casesmay be slightly offdue to rounding
