In a law office, the average number of billed hours per day was 147 last year. In the first 74 days of this year, the average number of billed hours per day is 158 with a standard deviation of 56...

In a law office, the average number of billed hours per day was 147 last year. In the first 74 days of this year, the average number of billed hours per day is 158 with a standard deviation of 56 hours. When testing the hypothesis (at the 10% level of signficance) that the average number of billed hours per day has increased, what crticial value? (please round your answer to 2 decimal places)