Use this frequency table to find the mean of the data Interv

Use this frequency table to find the mean of the data. Intervals: (50-69, 70-89, 90-109), Frequency: (5, 12, 7)

Question 6 options:

81.16

36.01

23.65

75.19

72.56

39.99

Solution

Intervals       Frequency           Mid Value            

50-69                 5                   (59+60)/2 = 59.5

70-89                12                  (79+80)/2 = 79.5

90-109              7                  (99+100)/2= 99.5

Mean = ( 59.5 *5 + 79.5*12 + 99.5*7) / ( 5+12+7) = 81.16 Answer -------> Option A