Scientific notation of 427 thousand

Anyone know? will mark brainliest if you're correct!

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

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys