Only 4% of people have Type AB blood.
a. On Average, how many donors must be checked to first find someone with Type AB blood?

25

Explanation:

If only 4% of all people have blood type AB, that's 4/100 or 1/25. So, one in each 25 donors, on average, will be type AB.

answer

the most effective ways of dealing with and reducing stress could be; listening to relaxing music, yoga, aromatherapy and meditation

explanation

when stress is effectively managed, it the effect stress has on a person’s life so they can be productive, happy and healthier. it is vital to identify the source of stress to be able to manage it. some stress management tips are keeping a positive attitude, practicing relaxation techniques, exercising regularly and eating healthier.