Hemoglobin level age less than 25 years 25–35 years above 35 years total less than 9 21 32 76 129 between 9 and 11 49 52 46 147 above 11 69 44 40 154 total 139 128 162 429 based on the data in the two-way table, the probability of being older than 25 years and having a hemoglobin level above 11 is . the probability of having a hemoglobin level above 11 is . being older than 25 years and having a hemoglobin level above 11 dependent on each other.

A.) The probability of being older than 25 years and having a hemoglobin level above 11 is 19.58%. Since the question is referring to persons older than 25 years, we'll include all the data above 25 years.
So under 25-35 years old is 44 and under 35 years old is 40.
   44 + 40 = 84
   84 / 429 = 0.1958 or 19.58%

B.) The probability of having a hemoglobin level above 11 is 35.66%. We would just get the ratio of 153 people who have hemoglobin level above 11 over the population of 429.
   153 / 429 = 0.356643 or 35.66%

C.) Being older than 25 years and having a hemoglobin level above 11 is not dependent on each other. Since the data is inversely proportional. The older the person gets, the lesser the number of people having hemoglobin level above 11 (A) 19.58%.