(b) In the manufacturing of a certain scientific instrument great importance is attached to the life of a particular critical component. This component is obtained in bulk from two sources, A and B, and in the course of inspection, the lives of 1000 of the components from each source are determined. The following frequency tables are obtained: - Source A Source B Life(hours).   No. Of components life(hours).   No.of component  1000-1020 1020-1040 1040-1060 1060-1080 1080-1100 1100-1120 40 X 364 372 85 43 1030-1040 1040-1050 1050-1060 1060-1070 1070-1080 1080-1090 339 136 25 20 130 350

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(b) In the manufacturing of a certain scientific instrument great importance is attached to the life of a particular critical component. This component is obtained in bulk from two sources, A and B, and in the course of inspection, the lives of 1000 of the components from each source are determined. The following frequency tables are obtained: -

Source A Source B
Life(hours).   No. Of components

life(hours).  

No.of component 

1000-1020

1020-1040

1040-1060

1060-1080

1080-1100

1100-1120

40

X

364

372

85

43

1030-1040

1040-1050

1050-1060

1060-1070

1070-1080

1080-1090

339

136

25

20

130

350

 

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