68 students choose to attend one of three after school activities: football, tennis or running. There are 24 boys. 3 students choose football, of which 2 are girls. 27 students choose tennis. 16 girls choose running. A student is selected at random. What is the probability this student chose running? Give your answer in its simplest form.

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.