Each student in a class of 50 was randomly assigned one line of a random number table. Each student then counted the odd-numbered digits in a 30 -digit line. The even digits are 0, 2, 4, 6, and 8. 

a. On average, in the list of 30 digits, how many odd-numbered digits would each student find? 

b. If each student found an 80 % confidence interval for the percentage of odd-numbered digits in the entire random number table, how many intervals (out of 50 ) would you expect not to capture the population percentage of 50%? 

a. On average each student would find nothing odd-numbered digits. 

b. It is expected that nothing intervals out of 50 will not capture 50%.