linq avg on grouped counts - linq

Question

Please consider this simple class
public class SEANCE
{
int ID_SEANCE {get;set;}
DateTime SEA_DATE {get;set;}
}
It's for a fitness management app, the SEANCE class is the session table for the members.
Here's my starting query to show the number of the sessions grouped by day Hour
var lst = ctx.SEANCES
.GroupBy(o => o.SEA_DATE.Hour)
.Select(g => new ChartData()
{
DT = new DateTime(2017, 01, 01, g.Key, 0, 0),
VALUE = g.Count()
});
return lst.OrderBy(a => a.DT).ToList();
as you can see, it returns the total number of sessions grouped by hour.
What I want instead is the average number of sessions by day and grouped by hour, and that's where I am a little lost :p
here what i mean
for example at 18, 1500 is corresponding to the total number of sessions at that time.
what i want instead is the average number by day
hope it make sense now :)

Answer 1

ctx.SEANCES.Count() / lst.Count(), but that seems like database source so better to use the result:
var groups = ctx.SEANCES
.GroupBy(s => s.SEA_DATE.Hour)
.OrderBy(g => g.Key)
.Select(g => new ChartData()
{
DT = g.First().SEA_DATE,
VALUE = g.Count()
})
.ToList();
var averageByHour = groups.Average(c => c.VALUE);
var averageByDay = groups.GroupBy(s => s.DT.Day).Average(g => g.Sum(c => c.VALUE));