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The number of years a Bulldog lives is a random variable with mean 9 and standard deviation 3, while for Chihuahuas, the mean is 15 and the standard deviation is 4. Approximate the probability the that in a kennel of 100 Bulldogs and 100 Chihuahuas, the average Chihuahua lives at least 7 years longer than the average Bulldog.

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utx Chi huahuas n 429,2 3, 4, nzlod I5-9 25 7,) o. 25 2. 2.

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