def interQuartile(values, freqs):
    l=[]
    for i in range(len(values)):
        for j in range(freqs[i]):
            l.append(values[i])
    l=sorted(l)
    if len(l)%2==0:
        print(float(statistics.median(l[len(l)//2:])-statistics.median(l[:len(l)//2])))
    else:
        print(float(statistics.median(l[(len(l)//2)+1:])-statistics.median(l[:len(l)//2])))