The daily sales of the store at Albany mall are normally distributed with a mean of $5,000 and a standard deviation of $1000.
a) What is the probability of a day with less than $6,000?
b) What is the probability of a day with less than 4,800?
c) What is the probability of a day with $3,750 and $6,250?
d) What is the probability of a day with more than $5,000?