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(11) The life span of urban rats is normally distributed. The average life span of an urban rat is 75 months, with a standard deviation

(11) The life span of urban rats is normally distributed. The average life span of an urban rat is 75 months, with a standard deviation of 6 months.

a. What is the probability that a random urban rat is older than 7 years old?

b. What is the probability that a random urban rat dies younger than 2 years old?

c. What proportion of urban rats die between 5 and 6 years old?

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