*****I need help with step by step directions and formulas on an excel sheet to complete this question. Thank you*****

Akiko operates a private medical research facility in Japan. The clinics monthly telephone bill is normally distributed with a mean of $67.69 and a standard deviation of $3. Akiko is considering a calling plan that has great benefit for a customer who often uses international calling and whose phone bill is more than $75 per month. However the plan also requires extra basic fee for the service. What is the probability that Akiko's phone bill is going to be more than $75.