38% of mobile phone users are their customers. The monthly charges of CallOften customers are with mean $65, and standard deviation $8. The monthly charges of non-CallOften customers are also normally distributed with mean $60 and standard deviation $10. (3 marks) A mobile phone user is randomly selected. What is the probability that this person monthly charge is over $63. Donna is a mobile phone user whose monthly charge is over $63. What is the chance that she is a non-CallOften customer?