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i.     If P represents the matrix of number of units of each type produced by factory A for both boys and girls, then
                             P is given by
                                  Boys Girls                                                             Boys Girls
                                 I 85 50                     I   II  III             80 75 90  I  II  III  I 80 80 
                                                                                                          
                                  
                             a.   II 65 55         b.  Boys      50 55 80      c.   Boys       d.  II 70 75   
                                                                                                          
                                  
                                                                                 Girls
                                  
                                III 72 80              Girls    85 65 72           80 70 65       III 65 90      
                                  
                          ii.  The total production of toys of each type for boys is given by the matrix
                                   I    II    III          I     II   III          I     II   III         I     II   III
                             a.                      b.                      c.                      d.
                                 [165  130   137]         [130  165  137]         [165  135  137]        [137 135 165]
                     2.   A city municipal council noted the number of malaria cases in two zones in 2022. The information is given as follows:
                           Table 1
                            Age (in years)     5-15        15-25        25-35         25-45        45-55        55-65
                             No. of cases       6            11           21           23           14            5


                           Table 2
                            Age (in years)     5-15        15-25        25-35         35-45        45-55        55-65

                             No. of cases       8            16           10           42           24           12
                          i.   The mean of the given data is

                             a.  26.2                                        b.  32.4
                             c.  33.5                                        d.  35.4

                          ii.  The upper limit of modal class is
                             a.  15                                          b.  25
                             c.  35                                          d.  45



                                 Lab                                                                       Interdisciplinary


                          Collect data from atleast 20 students on “Daily Time spent on Netflix/Mobile Gaming”. Arrange in a tabular
                          form as follows.
                                                         Student Name     No. of hours
                                                               A                      3
                                                               B                      5
                                                               C                      2
                                                               D                     10


                          Calculate variance and standard deviation of this data. What can you infer from the variance?



                Answers

                Exercise (Section A)
                A.  1. b    2. b    3. d    4. c    5. c    6. c    7. b    8. a    9. d    10. b
                B.  1. matrices    2. vector    3. least squares     4. statistics   5. Standard deviation    6. frequency bin
                C.  1. False    2. True    3. False    4. False    5. True     6. True     7. True

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