Use a Kruskal-Wallis Test to Test the Claim That the Samples

Use a Kruskal-Wallis test to test the claim that the samples come from populations with equal medians. SAT scores for students selected randomly from three different schools are shown
Below. Use a significance level of 0.05 to test the claim that the students from the three
Schools had the same median SAT score. School 1 School 2 School 3
$\begin{array} { l l l l l l l l l } 550 & 480 & 670 & 460 & 580 & 620 & 500 & 620 & 700 \end{array}$
$\begin{array} { l l l l l l l l l l } 400 & 600 & 520 & 380 & 600 & 470 & 450 & 550 & 760 \end{array}$ What would be the value of R1 that would be used in finding H?

A) R1 = 54
B) R1 = 52
C) R1 = 9
D) R1 = 6