3 0 CALCULATE CENTRAL TENDENCY FOR GROUP DATA Customers Number Midpoint Cumulative (FX) Lower Upper Class ages of (x) Frequency Boundary Boundary Boundary people (F) (CB) 9 15 2 16 22 6 23 29 9 30 36 4 37 43 11 44 50 16 51 57 2 MEAN MODE MEDIAN FIRST QUARTILE THIRD QUARTILE INTERQUARTILE RANGE DECILE PERCENTILE2 Class Intervals Tally Frequency 9 15 16 22 23 29 9 30 36 4 37 43 11 44 50 16 51 57 2 Customers ages Number of people 9 15 2 16 22 23 29 9 30 36 4 37 43 11 44 50 16 51 57 22 0 FRECUENCY DISTRIBUTION TABLE A sample of 50 customers at a newly opened supermarket has been selected at random The following data show the customers' ages 34 42 20 50 17 34 43 19 50 29 18 35 13 23 23 35 18 37 38 53 38 39 39 38 38 39 50 47 24 29 25 26 28 27 14 44 46 19 48 21 46 45 45 46 45 46 14 52 Number of Data n Number of class K K Class size C Formula K 1 3 33 log n C Highest value Lowest value K Solution n 50 customer 1 K 1 3 33 log (50) 6 64 7 53 9 C 7 6 29

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3 0 CALCULATE CENTRAL TENDENCY FOR GROUP DATA Customers Number Midpoint Cumulative (FX) Lower Upper Class ages of (x) Frequency Boundary Boundary Boundary people (F) (CB) 9 15 2 16 22 6 23 29 9 30 36 4 37 43 11 44 50 16 51 57 2   MEAN   MODE MEDIAN   FIRST QUARTILE   THIRD QUARTILE   INTERQUARTILE RANGE   DECILE   PERCENTILE2  Class Intervals Tally Frequency 9   15 16   22 23   29 9 30  36 4 37  43 11 44   50 16 51 57 2 Customers ages Number of people 9 15 2 16 22 23 29 9 30 36 4 37 43 11 44 50 16 51 57 22 0 FRECUENCY DISTRIBUTION TABLE A sample of 50 customers at a newly opened supermarket has been selected at random  The following data show the customers' ages  34 42 20 50 17 34 43 19 50 29 18 35 13 23 23 35 18 37 38 53 38 39 39 38 38 39 50 47 24 29 25 26 28 27 14 44 46 19 48 21 46 45 45 46 45 46 14 52 Number of Data  n Number of class K   K Class size   C Formula K  1  3 33 log n C  Highest value   Lowest value K Solution  n   50 customer 1  K 1 3 33 log (50)   6 64  7 53  9 C  7   6 29

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3.0 CALCULATE CENTRAL TENDENCY FOR GROUP DATA Customers Number Midpoint Cumulative (FX) Lower Upper Class ages of (x) Frequency Boundary Boundary Boundary people (F) (CB)

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