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 A small-to medium-capacity dehumidifier (11-25 pints) for a living room can run around $100-$250 or more, depending on size and features such as a humidistat to set the desired humidity, auto-shut-off when the tank's full, energy efficiency and quiet operation.
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.