In a class of students, the following data table summarizes how many students have a brother or a sister. What is the probability that a student chosen randomly from the class is an only child? Has a brother Does not have a brother
Has a sister 2 13
Does not have a sister 5 6

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?