For the normal distribution described in Exercise 7.10, what is the probability that a randomly selected passenger

Question:

For the normal described in Exercise 7.10, what is the probability that a randomly selected passenger trip would have produced a revenue
a. Between $1.55 and $1.80?
b. Over $1.90?
c. Under $1.25?
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...