An arts and craft supply store has a large crate that contains brass, copper, and silver beads. Several friends take turns pushing their hands into the beads, grabbing one, recording the bead type, and placing the bead back into the crate. They then repeat the process. The table shows the count for each bead type. Write a probability model for choosing a bead.

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Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.