Arrange in order from least to greatest 6.1, the square root of 36, and 6 AND 1/2​

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

Ineed me i stuck and i don’t want to get it wrong

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500