100 students at a college went on a trip.

Complete the two-way table below.

Males 28 + 9 = 37

Females 41 + 22 = 63

Total 69 + 31 = 100

One of these students is chosen at random.

What is the percentage of the probability that these students went to Paris?

Give your answer as a percentage.

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z