Types of courier providers in South Africa​

Abakery wants to determine how many trays of doughnuts it should prepare each day. demand is normal with a mean of 5 trays and standard deviation of 1 tray. if the owner wants a service level of at least 95%, how many trays should he prepare (rounded to the nearest whole tray)? assume doughnuts have no salvage value after the day is complete.

What is overdraft protection (odp)? a.) a cheap and easy way to always avoid overdrawing a bank account b.) a service to automatically transfer available funds from a linked account to cover purchases, prevent returned checks and declined items when you don’t have enough money in your checking account at the time of the transaction. c.) an insurance policy sold by banks to prevent others from withdrawing your money d.) a service provided by the government that insures individuals bank deposits up to $250,000

Why is efficiency an important economic goal?