Question: I need help with question number 2. 1. Spiral Everglo Bulbs are known to have a mean of life of 500 hours and a standard

I need help with question number 2.

1. Spiral Everglo Bulbs are known to have a mean of life of 500 hours and a standard deviation of 40 hours. Given that the lifetimes of the bulbs are normally distributed, what percentage of bulbs sold would you expect to last more than 400 hours?

2. They also are producing the halogen type Bulb and their mean life is 384 hours with a standard deviation of 50 hours. Given that the lifetimes of the bulbs are normally distributed, what is the estimated product lifetime for upper 90% product?

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