Gerald buys a bag of 7,500 assorted beads online. A random sample of 150 beads contains 17 red beads. Predict the number of assorted beads that Gerald bought.
you times 17 by 50 since you know in every 150 beads 17 are reds so you get 850 red beads and you times 150 by 50 and get 7500 so in 7500 you get 850 red beads.
