A sample of participants took part in a hearingexperiment. Among other things, the absolute hearing threshold (in decibels) wasmeasured for each participant. The measurements were as follows:

25,22,18,35,37,34,31,27,24,21,33,33,33,30,30,30

Draw the histogram for these data using an initial class boundary of and a class width of . Note that you can add or remove classes from the figure. Label each class with its endpoints.