def fever(filename, threshold):
    lpatients = []
    with open(filename, 'r') as f:
        for line in f:
            line = line.strip().split(':')
            lfever = []
            for value in line[1:]:
                lfever.append(float(value))
            if sum(lfever)/len(lfever) > threshold:
                lpatients.append(line[0])
    return lpatients