SOLUTION
The column for stems represents the ages in tens. While the column for actors and actresses represents what number value in tens. For exmaple
The 2 in the stem column represents 20s. Now, for actresses, this means we have actresses that are 21, 24, 26, 26, 26 and 27 years of age.
Now let's answer the questions
(a) The age of the youngest actor to win an Oscar.
You can see that in the column for actor, there is no number for stem 2. This means no actor is in the 20s years of age. Ages of the actor starts from stem 3, which is 30s.
So, the youngest actor is therefore 31 years.
(b) Age difference between the oldest and youngest actress.
You can see that stem 8, will represent the oldest actor or actress.
So looking at the actress column the oldest actress is 80 years and the youngest is 21 years.
Difference becomes 80 - 21 = 59 years
(c) Oldest age shared by two actors
The oldest actor will be 76. But we are looking at two actors having the same ages, which are at the same time the oldest ages.
Looking at stem 5, we have two 6s under actors. Meaning that two actors are 56 years and 56 years.
Therefore the answer is 56 years.