On a school trip the ratio of the number of teachers to the numbers of students is 1 : 15. The ratio of the number of male students to the number of female students is 7 : 5. Work out the percentage of all the people on the trip are female students. Give your answer correct to the nearest whole number.

The fraction of defective integrated circuits produced in a photolithography process is being studied. a random sample of 300 circuits is tested, revealing 17 defectives. (a) calculate a 95% two-sided confidence interval on the fraction of defective circuits produced by this particular tool. round the answers to 4 decimal places. less-than-or-equal-to p less-than-or-equal-to (b) calculate a 95% upper confidence bound on the fraction of defective circuits. round the answer to 4 decimal places. p less-than-or-equal-to

If the equation of a line containing the midsegment of a triangle is y = -1/4x -11, what is the slope of the triangle side that is opposite the midsegment (the one not touching it). explain how you know.

Place the indicated product in the proper location on the grid. -4x3y2(7xy4)