The following histogram presents a summary of the results of a questionnaire given to a sample of adult online students at OU. The students were asked how many hours per week they study for PSY 1110. The number of hours per week spent on study has been grouped into intervals, and the frequency indicates the number of students in each interval. (Note: all lines in the histogram were intended to be black, so treat blue lines as if they were black--in other words the color difference is not meaningful.)

(HINT: Convert the histogram to a Grouped Frequency Distribution in order to answer the questions below. The "Creating a Grouped Frequency Distribution from a Histogram" document under Instruction Materials will be helpful.)