Practice Questions on Statistics (Frequency Distribution)

1.  Listed below are the temperature in °C for 10 days.
    –6, –8, 0, 3, 2, 0, 1, 5, 4, 4
    What is the range of the data?
2.  Find the sum of mode and median of the data:
    12, 15, 11, 13, 16, 15, 16, 16, 8, 15, 17, 18, 11, 16, 12, 13
3.  Given below the ages of 40 students in a class. Their ages are as follows: 
    13, 21, 6, 5, 8, 17, 14, 13, 6, 6, 7, 8, 15, 16, 9, 10, 10, 9, 7, 8, 15, 14, 12, 11, 9, 7, 6, 8, 9, 10, 13, 17, 17, 16, 9, 12, 9, 8, 13, 14
Construct a frequency distribution table with class intervals 5-10, 10-15 etc.

4. The hourly wages (in Rs.) of 40 workers in a company are given below:
    30, 35, 90, 10, 35, 36, 69, 45, 98, 89, 82, 86, 35, 83, 85, 35, 38, 88, 84, 75, 65, 70, 55, 78, 69, 82, 47, 32, 85, 95, 30, 36, 92, 12, 34, 76, 64, 25, 48, 99
Construct a frequency distribution table.

5.  The marks scored by 15 students in a math exam are as follows:
    59, 65, 63, 66, 70, 46, 42, 56, 78, 65, 54, 47, 59, 65, 79, 22, 25, 35, 25, 20, 12, 8, 7, 26, 16, 24, 9, 32, 32, 23, 40, 25, 15, 12, 19, 57, 29, 25, 84, 92
   For the given data, find the value of
    (a)  Range    (b)   Mean
    (c)   Median    (d)    Mode
   (e) Also made a frequency distribution table for the above data.