Hello, I need assistance with these questions.

Could you walk me through the steps in a step by step fashion, and if possible, could you attach how to retrieve the information via a TI-84+ calculator

1) A community college offers classes 6 days a week: Monday through Saturday. Maria conducted a study of the students in her classes to determine how many days per week the students who are in her classes come to campus for classes. In each of her 5 classes, she randomly selected 10 students and asked them how many days they come to campus for classes. Each of her classes are the same size.

Formatted in a chart from left to right:

# of days: 1; 2; 3; 4; 5; 6

Frequency: 2; 12; 10; Blank; 0; 1

Relative Frequency: Blank; .24; .20; Blank; Blank; .02

Cumulative Relative Frequency: Blank; Blank; Blank; .98; Blank; 1.00

a) How many students come to campus for classes four days a week?

b) What is the 60th percentile for this data?

2) The lifetime of a computer circuit board is normally distributed with a mean of 2,500 hours and a standard deviation of 60 hours. What is the probability that a randomly chosen board will last at most 2,560 hours?

3) Suppose the Phi Beta Kappa honours the top one percent of college and university seniors. Assume that grade point means (GPA) at a certain college are normally distributed with a 2.5 mean and a standard deviation of 0.5. What would be the minimum GPA needed to become a member of Phi Beta Kappa at that college?

Thanks,