A sample of 20 measurements on a normally distributed quality characteristic had x = 350 and s

Question:

A sample of 20 measurements on a normally distributed quality characteristic had x = 350 and s =10 . Find an upper natural tolerance limit that has probability 0.90 of containing 95% of the of this quality characteristic.
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...