A distribution of numbers is approximately bell shaped. If the mean of the numbers is 130 and the standard dev?

superdeduper

New member
a. between what two numbers would approximately 68% of the values fall?
b. Between what two numbers would 95% of the values fall?
c. Between what two values would 99.7% of the values fall?

I know that median + standard deviation = higher number
and median - standard deviation = lower number

But I don't understand how to do it with different percentages?
Thank you for your help!
 
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