The mean lifetime of a wristwatch is 25 months, with a standard deviation of 5 months. If

Question:

The mean lifetime of a wristwatch is 25 months, with a standard deviation of 5 months. If the is normal, for how many months should a guarantee be made if the manufacturer does not want to exchange more than 10% of the watches? Assume the variable is normally distributed.
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...