PROGRAMMING:Average age
###Task description
There are several students in the class, give the age of each student (integer), find the average age of all students in the class, and keep it to two decimal places.
###Input format:
The first line has an integer n (1 < = n < = 100) indicating the number of students. The next N lines have an integer in each line, which represents the age of each student, and the value is 15 to 25.
###Output format:
Output a line that contains a floating-point number, which is the required average age, reserved to two decimal places.
###Input example:
```in
two
eighteen
seventeen
```
###Output example:
```out
seventeen point five zero
```
###Title Source
Note: this topic is selected from openjudge website http://noi.openjudge.cn/ch0105/01/
###Analysis tips
In this paper, we first read the integer n, and then read n integer ages through N cycles, and add them to the variable sum representing the sum of ages. Pay attention to the initial value setting of loop variable I and the setting of loop conditions to ensure that the loop is executed n times. Pay attention to the initial value setting of age and variable sum. Note that the average value should be converted to real type.
answer：If there is no answer, please comment
There are several students in the class, give the age of each student (integer), find the average age of all students in the class, and keep it to two decimal places.
###Input format:
The first line has an integer n (1 < = n < = 100) indicating the number of students. The next N lines have an integer in each line, which represents the age of each student, and the value is 15 to 25.
###Output format:
Output a line that contains a floating-point number, which is the required average age, reserved to two decimal places.
###Input example:
```in
two
eighteen
seventeen
```
###Output example:
```out
seventeen point five zero
```
###Title Source
Note: this topic is selected from openjudge website http://noi.openjudge.cn/ch0105/01/
###Analysis tips
In this paper, we first read the integer n, and then read n integer ages through N cycles, and add them to the variable sum representing the sum of ages. Pay attention to the initial value setting of loop variable I and the setting of loop conditions to ensure that the loop is executed n times. Pay attention to the initial value setting of age and variable sum. Note that the average value should be converted to real type.
answer：If there is no answer, please comment