Average of Top K Scores

You are given T test cases. For each test case, you are provided with an integer N which represents the number of scores and an integer K indicating the number of highest scores to consider. Then, a sequence of N scores is given. Your task is to calculate the average of the top K scores for each test case.

The average must be computed using the following formula:

\(\text{average} = \frac{\sum_{i=1}^{K} s_i}{K}\)

where \( s_i \) are the top K scores. Round the answer to two decimal places.

Print the answer for each test case on a new line.

inputFormat

The input begins with an integer T, the number of test cases. Each test case consists of two lines:

• The first line contains two integers N and K, separated by a space.
• The second line contains N space-separated integers representing the scores.

outputFormat

For each test case, print a single line containing the average of the top K scores, rounded to two decimal places.

## sample

4
5 3
50 90 80 70 60
2 2
30 45
4 2
100 100 100 100
6 1
20 40 60 80 100 90

80.00
37.50
100.00
100.00

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