In a z table of standard normal probabilities, the numbers in the table represent areas under the curve . A) to the right of the z score
B) to the left of the z score
C) between the mean and the given z score

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