LS1178: The lifetimes of a colour TV picture tube is normally distributed, with a mean of 8 yrs and a standard deviation of 2 years

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Question: The lifetimes of a colour TV picture tube is normally distributed, with a mean of 8 yrs and a standard deviation of 2 years.

1. What is the probability that a picture tube will last more than 10 yrs?

2. If the firm guarantees the picture tube for 4 yrs,
what percentage of the tubes sold will have to be replaced?


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