# confusing math that i dont understand

**Question description**

Jim tree wants to analyze his shipment of trees based on height. He knows the height of the trees is normally distributed so he can use the standard normal distribution. He measures the height of 100 randomly selected trees in his shipment. He finds the mean is 65 inches and the standard deviation is 10 inches.

What percentage of the trees will be between 55 inches and 75 inches Answer in terms of percentage

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