Finding average

import datetime
from django.db import models
from django.utils import timezone
# Create your models here.
class College(models.Model):
college_text=models.CharField(max_length=200)
pub_date = models.DateTimeField('date published')
def __unicode__(self):
return self.college_text

class Rating(models.Model):
college=models.ForeignKey(College)
rating=models.BigIntegerField()
views=models.CharField(max_length=200)
def __unicode__(self):
return self.views

{{college.college_text}}

{% for rating in college.rating_set.all %}
• {{rating.rating}}
{% endfor %}

{% if latest_college_list %}

{% for college in latest_college_list %}
• {{ college.college_text }}
{% endfor %}

{% else %}

No polls are available.

{% endif %}

I have attached my model files and template files. Please tell how can i find avg of rating for a particular college. In current format it is displaying rating of all colleges correctly.
Along with this I also want to add avg ratings for college.
I have used foriegn key in this.

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