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X is a normally distributed random variable with mean 55 and standard deviation 17. What is the probability that X is between 21 and 89?

X is a normally distributed random variable with mean 55 and standard deviation 17.

What is the probability that X is between 21 and 89?

Use the 0.68-0.95-0.997 rule and write your answer as a decimal. Round to the nearest thousandth if necessary.

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