def ProbRange(pmf, low, high):
    """Computes the total probability between low and high, inclusive.
    
    Args:
        pmf: Pmf object
        low: low value
        high: high ValueError
        
    Returns:
        float probability
    """
    total = 0.0
    for week in range(low, high+1):
        total += pmf.Prob(week)
    return total