Question: 90 % of the values are between what two X-values (symmetrically distributed around the mean)?

(90% of the values are greater than ________ and less than __________)

I don't know how to solve this question at all, if calculations are needed to solve it, I'd appreciate an explanation with Excel if possible, Thanks!

Previous work and context:

_ Homework: Assignment4 Given a normal distribution with p = 100 and o = 10, complete parts (a) through (d). E Click here to view page 1 of the cumulative standardized normal distribution table. Click here to view page 2 of the cumulative standardized normal distribution table. a. What is the probability that X > 80? The probability that X > 80 is 0.9773 . {Round to four decimal places as needed.) b. What is the probability that X 105? The probability that X