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The mean life expectancy for a healthy American is 78 years with a standard deviation of 5 years. Assuming that the distribution is bell-shaped, to

The mean life expectancy for a healthy American is 78 years with a standard deviation of 5 years. Assuming that the distribution is bell-shaped, to what age can about 95% of all Americans expect to live? Provide an upper and lower bound.

a) 77 and 79

b) 63 and 93

c) -4 and 4

d) 68 and 88

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