Mathematics

Cristina Hernandez

21 July, 19:00

James surveyed people at school and asked whether they bring their lunch to school or buy their lunch at school more often. The results are shown below.

Bring lunch: 46 males, 254 females

Buy lunch: 176 males, 264 females

The events "male" and "buys lunch" are not independent because

P (buys lunch | male) = P (male) = 0.4.

P (male | buys lunch) = P (male) = 0.3.

P (buys lunch | male) = 0.3 and P (male) = 0.4.

P (male | buys lunch) = 0.4 and P (male) = 0.3.