1.   The set of data {67, 90, 83, 85, 73, 80, 78, 79, 68, 71} represents the ages at death of the first 10 U.S. Presidents. Find the range of the data.
    A. 4 B. 23
    C. 13 D. 18
    Hint

  2.   If the lowest class interval of the set of data
{67, 90, 83, 85, 73, 80, 78, 79, 68, 71} is 65-70,
find the class mark of that interval.
    A. 65 B. 67.5
    C. 70 D. 2
    Hint

  3.   Use the set of data {67, 90, 83, 85, 73, 80, 78, 79, 68, 71}. If the data are grouped so that the lowest class interval is 65-70, how many classes are formed?
    A. 3 B. 4
    C. 6 D. 5
    Hint

  4.   For a set of data organized in a frequency distribution, the upper and lower values in each interval are called ______.
    A. class limits B. class marks
    C. class intervals D. the class range
    Hint

  5.   Find the class mark of 3040 interval for the following data.
22, 35, 12, 37, 19, 36, 39, 13, 13, 36, 11, 37, 13, 38, 21, 37, 35, 29, 37
    A. 37 B. 35
    C. 36 D. 38
    Hint