The mean number of calls to a fire station on a weekday is 8. What is the probability that on a given weekday there would be 11 calls?

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

The holiday party will cost $160 if 8 people attend. if there are 40 people who attend the party, how much will the holiday party cost