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Question: a suppose x follows a normal distribution with mean0 you...

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a.) Suppose X follows a Normal distribution with mean=0. You measured X and found that the value is x (that is not zero.) You calculated and found z score is exactly x. What is the standard deviation of this Normal distribution? (Hint: Consider x=1 case.)

a.) 0

b.) 1

c.) 2

d.) none of the above

b.)

The mean life of a certain car battery can be modeled using a Normal distribution with a mean of 4 years and a standard deviation of 1 year. Determine the following:

a) the probability the battery will die before 5 years

b) the probability the battery will last at least 5 years

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