Karen Gunna Leather is a Toronto - based company that manufactures and sells such cell phone pouches , wallets , leather belts and purses . The marketing director of Karen Gunna Leather is in analyzing the proportion of customers who prefer using cell phone pouches . The director contadied sample of 60 customers and 38.5 percent of them confirmed that they prefer using cell phone pouches . ( a ) Compute the standard error of proportions ( 1 mark ) ( b ) What is the probability that between 20 and 25 customers prefer using phone pouches ? ( marks ) ( ) What is the probability that more than 35 % of the customers prefer using cell phone pouches ? marks ) ( d ) State one possible reason why the marketing director uses sampling . Explain your reasoning ( 2 marks )