Converting Data to Tenths and averaging values - sql-server

Question

so I have a table in thousandths of a mile like this:
id |fk |from |to |speed|score
1 |123|10.002|10.003|20 |10
2 |123|10.003|10.004|25 |11
3 |123|10.004|10.005|40 |44
4 |123|10.005|10.006|50 |23
5 |123|10.006|10.007|20 |54
6 |123|10.007|10.008|10 |24
7 |123|10.008|10.009|65 |24
8 |123|10.009|10.010|23 |24
9 |123|10.010|10.011|74 |56
10 |123|10.011|10.012|25 |43
11 |123|10.012|10.013|10 |76
12 |123|10.013|10.014|5 |10
...
I need to convert the thousandth mile table to tenths of a mile and take average of speed and score like this:
id |fk |from |to |Avgspeed|Avgscore
1 |123|10.002|10.012|35.2 |31.3
10 |123|10.012|... |... |...
I came up with this query to get the tenth of a mile:
select CASE WHEN rn=1 then 1
when rn%10=0 then 1
else 0 end chk,x.* from
(
select row_number() over (partition by fk order by fk,from) rn,* from dbo.Thous_Data
)x
This gives me
id |fk |from |to |speed|score|chk|rn
1 |123|10.002|10.003|20 |10 |1 |1
2 |123|10.003|10.004|25 |11 |0 |2
3 |123|10.004|10.005|40 |44 |0 |3
4 |123|10.005|10.006|50 |23 |0 |4
5 |123|10.006|10.007|20 |54 |0 |5
6 |123|10.007|10.008|10 |24 |0 |6
7 |123|10.008|10.009|65 |24 |0 |7
8 |123|10.009|10.010|23 |24 |0 |8
9 |123|10.010|10.011|74 |56 |0 |9
10 |123|10.011|10.012|25 |43 |1 |10
11 |123|10.012|10.013|10 |76 |0 |11
12 |123|10.013|10.014|5 |10 |0 |12
...
Not sure how to proceed with getting the averages and setting up the from and to correctly. Any ideas appreciated.

Answer 1

Something like this?
SELECT 10 * FLOOR(id / 10) , AVG(speed), MIN( [from] ) , MAX( [to])
FROM dbo.Thous_Data
GROUP BY 10 * FLOOR(id / 10);

Answer 2

The way I was able to do it was by starting the count from 0 so that the brackets would be accurate:
with cte as
(select CASE WHEN rn=0 then 1
when rn%10=0 then 1
else 0 end chk,x.*
from
(
select ROW_NUMBER() over (partition by fk order by fk,from)-1 rn,* from dbo.Thous_Data
)x
)
,cte2 as(
SELECT
distinct fk,to,from,
SUM([Chk]) OVER (PARTITION BY fk ORDER BY to,from) AS Groups
FROM cte
)
Select distinct fk,
Min(from) over (partition by fk,groups) from_
,Max(to) over (partition by fk,groups) to_
,avg(speed) over (partition by fk,groups) Aspeed
,avg(score) over (partition by fk,groups) Ascore
from
cte2