Variable
Discrete
Continuous
(a) The lifetime, in hours, of a 100-watt light bulb manufactured by Northington Industries
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(b) The number of personal telephone calls made tomorrow at Bingley Corporation
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(c) The time for a participant to identify the color of the letters when the word red is shown in green letters on a computer screen
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(d) The number of defective compact discs in a batch of 500 discs
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