George was weighed at the doctors office. the scale read 67.20 pounds. the doctor wrote 67.2 on george’s chart. did the doctor make a mistake? explain to a friend.

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.

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

Suppose that 15 inches of wire cost 60 cents. at the same rate, how much (in cents) will 12 inches of wire cost