import fileinput

times = []
q = -1
for (count, line) in enumerate(fileinput.input()):
    if count == 0:
        n = int(line.strip())
    elif count == 1:
        times = list(map(lambda x: int(x.strip()), line.split(" ")))
        times.insert(0, 0)
        for i in range(1, n + 1):
            times[i] += times[i - 1]
    else:
        s = line.split(" ")
        if len(s) == 1 and q == -1:
            q = int(line)
        elif q != -1:
            if count - 2 > q: break
            (t0, t1) = tuple(map(lambda x: int(x), line.split(" ")))
            time = times[t1] - times[t0 - 1]
            print(time / (t1 - t0 + 1))