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•    If the combined mean of the two group is 13 and if the mean of one group with 10 observations is 15,
                             then calculate the mean of the other group with 8 observations?

                        •    Consider the following data:
                             4, 5, 8, 9, 10, 12, 16, 18

                             Calculate the variance and standard deviation of the given data.







                            Class Activity


                          Can you think of an event(s) where you have two cases, in your classroom environment? Capture the data and
                          plot on the histogram to have two peaks. Once done, tell your data story to the class.   [[CBSE Handbook]










































                 Answers


                 Exercise (Section A)
                 A.  1. b    2. d    3. c    4. a    5. c    6. b    7. d    8. a    9. c    10. b

                 B.  1. structured, unstructured          2. experimental unit    3. mode        4. categorical variable
                     5. number of peaks, skew, uniformity   6. Data exploration   7. Variance
                 C.  1. False        2. True         3. False        4. False        5. True
                 D.  1. e    2. d    3. b    4. a    5. c

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