If the difference in costs can be described by a normal, Basic Statistics

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If the difference in costs can be described by a normal

Pets

The American Veterinary Association claims that the annual cost of medical care for dogs averages $100, with a standard deviation of $30, and for cats averages $120, with a standard deviation of $35.

a) What's the expected difference in the cost of medical care for dogs and cats?

b) What's the standard deviation of that difference?

c) If the difference in costs can be described by a Normal model, what's the probability that medical expenses are higher for someone s dog than for her cat?

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