1 A restaurant owner wants to determine how much the average couple is willing to pay for dinner for two. The owner surveys 20 couples and finds that the average willingness to pay is $40 with a standard deviation of $12. However, the owner wants to be 95% confident that the sample mean falls within $2 of the true average. Note that z=1.96 for a 95% confidence interval. Please enter your answer as an integer, that is, with no digits to the right of the decimal