Based on data collected for Health Statistics, an estimate of the percentage of adults who have at some point in their life been told they have hypertension is 24.53%. If we select a simple random sample of 20 South African adults and assume that the probability that each has been told that he or she has hypertension is 0.25, find the probability that the number of people in the sample who have been told that they have hypertension will be:

i. Exactly three.

ii. Three or more.

iii. Fewer than three.

iv. Between three and seven (both inclusive).

v. What is the average number of South African adults who have been told that they have hypertension?