Suppose a variable is normally distributed with a population mean of 916 and a population standard deviation of 19. If 7 samples, each of size 111 are taken, what would be the standard deviation of the means of those samples?

Helll ! 1,400 tons of wheat of two different varieties was delivered to the silo. when processing one variety, there was 2% of waste and 3% during the processing of the second variety of wheat. after the processing, the amount of remaining wheat was 1,364 tons. how many tons of each variety of wheat was delivered to the silo?