1 Explain that a population pyramid shows the age and sex structure of a population. 2  Point to the horizontal bars, which show the percentage (or the absolute number) of males and females in each age group. 3  Have students interpret the chart.
1 Although they range from $150-$400 or more, a large capacity (25-70 pints) dehumidifier for a basement (the dampest portion of most homes) or other large area averages $200-$300.
1 If you have gutters, extend the downspouts. 2  Simple above-ground extensions of 3-25 feet are $10-$50 each. 3  Extending downspouts into underground drainage pipes or a drywell can cost $100-$400 for do-it-yourself materials and $200-$2,000 or more with professional installation. Large-capacity, low-maintenance dehumidifiers for extremely damp or large basements start around $800-$1,200. 2  Installing a sump pump runs$100 -$300 for do-it-yourself installation in a typical family home, or $250-$600 for both parts and labor to have a plumber or waterproofing contractor install it for you.