Macs fast-food restaurant finds that its daily profits have a normal distribution with mean $140 and standard

Question:

Mac’s fast-food restaurant finds that its daily profits have a normal with mean $140 and standard deviation $80.
a. Find the probability that the restaurant loses money on a given day (that is, daily profit less than 0).
b. Find the probability that the restaurant makes money for the next seven days in a row. What assumptions must you make for this calculation to be valid?
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...