Number of Adults Contracting Colds Cold
No Cold
Total
Vitamin C Pill
21
129
150
Sugar Pill
33
117
150
Total
54
246
300
The table shows the results of a research study that investigated the therapeutic value of
vitamin C in preventing colds. A random sample of 300 adults received either a vitamin C pill or
a sugar pill each day during a 2-week period, and the adults reported whether they contracted a
cold during that time period. What is the probability of adults who received a sugar pill reported
contracting a cold? |