Can you explain to me how this is the answer, please and thank you!

(1-3) Suppose the weight of healthy hens are normally distributed with mean 6 pounds and standard deviation one pound (both the population mean and population standard deviation are known). (1) Calculate the proportion of healthy hens which are greater than 7 pounds. (A) 1% (B) 99% (C) 0.84% (D) 84.1% (E) 15.9% (2) What is the population mean and population standard error of the average weight (sample mean) of 10 healthy hens? (A) u = 6, se = + (B) / = 6 and se = 1 (C) 4 = 6 and se = 716 (D) # = 6 VIG: Se = 10 (E) u is unknown and se is unknown. (3) Calculate the chance that the sample mean of 10 healthy hens is less than 5 pounds. (A) 3.16% (B) 96.84% (C) 99.9% (D) 0.08% (E) 15.9%