A sample of the daily production of transistors at Scott Electronics is grouped in a frequency distribution: Daily production Frequency 80-90 5 90-100 9 100-110 20 110-120 8 120-130 6 30-140 2 Estimate the mean and the standard deviation around the mean daily productions.

a.      A sample of the daily production of transistors at Scott Electronics is grouped in a frequency distribution:

            Daily production                   Frequency

            80-90                                       5

90-100                                     9

100-110                                   20

110-120                                   8

120-130                                   6

30-140                                     2

Estimate the mean and the standard deviation around the mean daily productions.