The file contains the life (in hours) of a sample of 40 100-watt light bulbs produced by Manufacturer A and a sample of 40 100-watt light bulbs produced by Manufacturer B. The table in the next column shows these data as a pair of ordered arrays:
Use the following class interval widths for each distribution:
Manufacturer A: 650 but less than 750, 750 but less than 850, and so on.
Manufacturer B: 750 but less than 850, 850 but less than 950, and so on.

a. Construct percentage histograms on separate graphs and plot the percentage polygons on one graph.
b. Plot cumulative percentage polygons on one graph.
c. Which manufacturer has bulbs with a longer life- Manufacturer A or Manufacturer B? Explain.

Transcribed Image Text:

Manufacturer A Manufacturer B 684 697 720 773 821819 836 888 897 903 831 835 848 852 852907 912 918 942 943 859 860 868 870 876 952 959 962 986 992 893 899 905 909 91 994 1,004 1,005 1,007 1,015 922 924 926 926 938 1,016 1,018 1,020 1,022 1,034 939 943 946 954 971,038 1,072 1,077 1,077 1,082 972 977 984 1,005 1,014,096 1,100 1,113 1,113 1,116 1,016 1,041 1,052 1,080 1,093 1,153,154 1,174 1,188 1,230