The number obtained by dividing the sum of the numbers in a data group by the number of terms in the group is called the arithmetic mean of that data group. In a group consisting of people of different ages, the youngest person is 1 year old and the oldest person is 92 years old. When the youngest person in the group is excluded, the arithmetic mean of the ages of the others is 45, and when the oldest person in the group is excluded, the arithmetic mean of the ages of the others is 38. Accordingly, how many people are in the group? A) 12 B) 14 C) 16 D) 18 E) 20
The number obtained by dividing the sum of the numbers in a data group by the number of terms in the group is called the arithmetic mean of that data group.
In a group consisting of people of different ages, the youngest person is 1 year old and the oldest person is 92 years old.
When the youngest person in the group is excluded, the arithmetic mean of the ages of the others is 45, and when the oldest person in the group is excluded, the arithmetic mean of the ages of the others is 38.
Accordingly, how many people are in the group?\\
A) 12\\
B) 14\\
C) 16\\
D) 18\\
E) 20