U. S. Custom officials believe that 25% of ships arriving in the U. S. From foreign countries contain contaminated cargo. To test the claim, officials randomly select 50 ships during a given year and find that 22% contained contaminated cargo. At a significance level of .05, use the sample data to test the U. S. Custom official's claim.

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?