According to an IRF surrey conduct ed by BICresearch, the average family spends about 323? on el {computers_. cellphones, etc.) in postsecondary backtoschool spending per student. Suppose t spending on electronics is normally distributed with a standard deviation of $54. If a family of a retur secondary st ndent is randomly selected, what is the probability that : 1. They spend less than 3151] on backtoschool electronics '3 2. They spend less than 3401] on backtoschool electronics '3 3. They spend between $1243 and $185 on backtoschool electronics '