Suppose the number of minutes spent exercising each day for adults in the U. S. are normally distributed with an unknown population mean and standard deviation. If a random sample of 20 adults is taken to estimate the mean length of daily exercise, what t-score should be used to find a 80% confidence interval estimate for the population mean?

Item 1 which question could the expression 1000n answer? let n = the number of gallons of gas used. how many miles per gallon did the car get driving 1000 miles? let n = the number of grams of food needed for each dog. how many grams of food are needed to feed 1000 dogs? let n = the number of people at the show. how many empty seats were there at the show if there are 1000 seats at the theater? let n = the number of seats at the theater. how many empty seats will there by if 1000 people come to the show?