A card is drawn randomly from a standard 52-card deck. Find the probabilities of the given events. a. The card drawn is a 8.
b. The card drawn is a face card (Jack, Queen, or King).
c. The card drawn is not a face card.

Many of the houses have fireplaces that are 15% efficient and use 15 kg of wood to heat a room to 20 degrees celsius. wanting to reduce their ecological footprint, several of the homeowners are considering switching to woodstoves that are 75 percent efficient. if they do change to using a woodstove, how many kilograms of wood will they save per use?