At a certain bakery, the price of each doughnut is $1. 50. Let the random variable d represent the number of doughnuts a typical customer purchases each day. The expected value and variance of the probability distribution of d are 2. 6 doughnuts and 3. 6 (doughnuts)2 , respectively. Let the random variable p represent the price of the doughnuts that a typical customer purchases each day. Which of the following is the standard deviation, in dollars, of the probability distribution of p ?.

Spider crabs live in the shallow regions of the ocean floor. algae tend to grow on the surface of spider crabs. the algae provide the crabs protection from predators by camouflaging them. the spider crabs give the algae shelter. what does this description suggest? 1. the algae are parasites of the spider crabs. 2. the algae and the spider crabs have a mutualistic relationship. 3. the spider crabs are commensals, and the algae are parasites. 4. the spider crabs benefit from the algae living on them. 5. the spider crabs are parasites of the algae.