I was not in class for this section could you please help me with these homework problems?

SAME WATER STORY: The Old Farmer's Almanac stated that the average consumption of water per person per day was 123 gallons. Pamela thinks that the average consumption of water nowadays is lower, so she selects 36 people and found that they used on average 121 gallons per day and the sample standard deviation was 6.3. At a =0.05, is there enough evidence that Old Farmer's Almanac average should be lowered today? WATER QUESTION 8: What is the critical number for this test? (you may need the table & to answer) O -1.99 O -1.55 O -2.3 O -1.69 O -2.49 O -0.87 O -0.23