The average amount of money spent for lunch per person in the college cafeteria is $5.77 and the standard deviation is $2.31. Suppose that 9 randomly selected lunch patrons are observed. Assume the distribution of money spent is normal, and round all answers to 4 decimal places where possible.

1. What is the distribution of X? X ~ N(,)
2. What is the distribution of X? X ~ N(,)
3. For a single randomly selected lunch patron, find the probability that this patron's lunch cost is between $6.425 and $7.37.
4. For the group of 9 patrons, find the probability that the average lunch cost is between $6.425 and $7.37.
5. For part d), is the assumption that the distribution is normal necessary YES OR NO