QUESTION 23 3 points Save Answer During a cold winter, the temperature stayed below zero for ten days (ranging from -20 to -5). The variance of the temperatures of the ten-day period: Is negative since all the numbers are negative Must be at least zero Cannot be computed since all the numbers are negative Can be either negative or positive QUESTION 24 3 points Save Answer The average age in a sample of 90 students at City College is 20. What can you say about the average age of all the students at City College? Must be more than 20, since the population is always larger than the sample Must be less than 20, since the sample is only a part of the population Could not be 20 Could be larger, smaller, or equal to 20