3.The lifetimes of a colour TV picture tube is normally distributed, with a mean of 8 yrs and a stan

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

(i)What is the probability that a picture tube will last more than 10 yrs?

(ii)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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