Evaluate x+y when x=−45 and y=13. Write your answer as a fraction or mixed number in simplest form.
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Since 5 is divisible by 10 and 5, we can factor out a 5 from both terms.
Or, if you're familiar with the empirical rule and the basic properties of the normal distribution, you can use the fact that approximately
which means about
Because the distribution is symmetric, you have