Suppose at random 35% of school children develop nausea and vomiting following holiday parties and that you conduct a study to examine this phenomenon, with a sample size of n=21. What is the probability that between more than 15 and 20 or less children become sick?

1, A grocery store carries the following items. There are two main categories of food - conventional and organic ingredients - and four food groups. The data are shown in the following table.

Food Groups

Food Categories ---------------Grains Fruits Veg Meat Total

Conventional ----------------------139 110 ------54- 84 387

Organic ------------------------------36 15 -----246 131 428

Total --------------------------------175 125 -----300 215 815

If all of the conventional items were accidentally displayed together without a sticker or label to mark their origin, what is the probability that you select a conventional fruit or meat into your grocery basket? First compute for yourself the row (i.e., n1+, n2+), column (i.e., n+1, n+2, n+3, n+4), and overall (i.e., n++) totals, to aid in answering the question.