Statistics

Topics in this chapter

• Data Collection and Sources
• Frequency Distributions and Class Intervals
• Statistical Graphs and Presentation
• Arithmetic Mean
• Median and Mode
• Range and Effects of Data Changes

Cheat sheet

Practice questions

1. Question 1Q-141214

   What is the arithmetic mean of 6, 8, 10, 12 and 14?

   1. A.8
   2. B.9
   3. C.10
   4. D.12
   See the answer and solution
2. Question 2Q-6BAC0D

   The observations 11, 7, 5, 13, 9, 15 and 17 are arranged in ascending order. What is their median?

   1. A.9
   2. B.11
   3. C.13
   4. D.15
   See the answer and solution
3. Question 3Q-797483

   A data set has values 2, 4, 6 and 8 with corresponding frequencies 3, 5, 4 and 2. What is its mean?

   1. A.33/7
   2. B.66/7
   3. C.5
   4. D.6
   See the answer and solution
4. Question 4Q-40310B

   What is a frequency polygon, and how is it constructed for grouped data?

   See the answer and solution
5. Question 5Q-E9317F

   Find the mode of the data: 4, 7, 4, 9, 6, 4, 7, 8.

   1. A.4
   2. B.6
   3. C.7
   4. D.8
   See the answer and solution