19. The following table gives the lifetime in hours of 400 radio tubes of a certain make. Find the mean lifetime of the radio tubes. Number of Lifetime Number of tubes Lifetime tubes (in hours) (in hrs.) Less than 800 Less than 900 Less than 1,000 Less than 1,100 265 324 Less than 300 Less than 400 Less than 500 Less than 600 20 60 374 116 392 Less than 700 194 Less than 1,200 400 1.

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19. The following table gives the lifetime in hours of 400 radio tubes of a certain make.
Find the mean lifetime of the radio tubes.
Number of
tubes
Lifetime
Number of tubes
Lifetime
(in hrs.)
(in hours)
Less than 800
Less than 900
Less than 300
Less than 400
Less than 500
265
324
374
392
20
Less than 1,000
Less than 1,100
60
116
Less than 600
Less than 700
194
Less than 1,200
400
altaas
Transcribed Image Text:19. The following table gives the lifetime in hours of 400 radio tubes of a certain make. Find the mean lifetime of the radio tubes. Number of tubes Lifetime Number of tubes Lifetime (in hrs.) (in hours) Less than 800 Less than 900 Less than 300 Less than 400 Less than 500 265 324 374 392 20 Less than 1,000 Less than 1,100 60 116 Less than 600 Less than 700 194 Less than 1,200 400 altaas
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