Hannah made 8 pints of lemonade how many glasses can she fill with 1/2 pint

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Arandom sample of 45 observations results in a sample mean of 68. the population standard deviation is known to be 23 a. compute the margin of error at a 959% confidence interval. b. compute the 95% confidence interval for the population mean c. compute the 90% confidence interval for the population mean. d. compute the 75% confidence interval for the population mean

Did i do these question right? if not explain why it’s wrong?