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The life spans of batteries are normally distributed, with a mean of 2000 hours and a...

The life spans of batteries are normally distributed, with a mean of 2000 hours and a standard deviation of 30 hours.

a. How would we know by looking at the graph, if the probability of batteries with a life span of less 1900 hours is more or less than 50%> Explain your answer. DO NOT show any mathematical work.

b. What percent of batteries have a life span that is more than 2065 hours? Show work as in class.

Math   Statistics-And-Probability   
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