Please help me with this i dont know what this means​

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Astandard american eskimo dog has a mean weight of 30 pounds with a standard deviation of 2 pounds. assuming the weights of standard eskimo dogs are normally distributed, what range of weights would 99.7% of the dogs have? approximately 26–34 pounds approximately 24–36 pounds approximately 28–32 pounds approximately 29–31 pounds

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?