Question

In Ireland the percent of people with type A blood is 31%, those with type B blood is 11%, and those with type AB blood is 3%. The rest have type O blood.

a) If a random person in Ireland walks in to give blood what is the probability that
i. The person has type O blood?

Answer 1

To find the probability of a random person in Ireland having type O blood, we subtract the sum of the percentages of other blood types (31% + 11% + 3% = 45%) from 100%, giving us 55% or 0.55 as the probability for type O blood.

Step-by-step explanation:

The question pertains to the probability of a random person in Ireland having type O blood based on given percentages for other blood types. To calculate this probability, we begin by totaling the percentages of type A, type B, and type AB blood, which are given as 31%, 11%, and 3% respectively.

Summing these percentages gives us 45% for the people with A, B, or AB blood types. Since these percentages must add up to 100% to account for the entire population, we can determine the percentage of those with type O blood by subtracting this total from 100%.

To find the percentage of those with type O blood, the calculation is as follows:

100% - 45% = 55%

Therefore, the probability (p) that a random person has type O blood is 55% or 0.55 when expressed as a decimal.