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The lifetime of a certain type of colour television

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Reference no: EM13580570

Question: The lifetime of a certain type of colour television picture tube is known to follow a normal distribution with a mean of 4600 hours and a standard deviation of 400 hours.

Calculate the probability that a single randomly chosen tube will last:

a. more than 5000 hours
b. less than 4500 hours
c. between 4700 and 4900 hours

Reference no: EM13580570

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