Apple Inc. guarantees that iPhones will not have any type of malfunctioning for one year. Suppose 90% of the iPhones operatewithout any malfunctionfor one year. Suppose I take arandom sample(this means you can assume they are independent) of 80 iPhones and count the number of defectives. If X is the number ofdefectivesin the sample of 80 iPhones;

What is the probability that exactly 10 iPhones will have some type of problem within a year of the sold date (Use the exact distribution, not an approximation)?