What is the raito of 64 to 60

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

Which of these numbers of simulations of an event would be most likely to produce results that are closest to those predicted by probability theory? 15, 20, 5, 10

What are the digits that repeat in the smallest sequence of repeating digits in the decimal equivalent of 24/11?