The number of accidents that a person has in a given year is a poisson random variable with mean λ. however, we may suppose that the rate λ depends on the person or portion of the population. suppose that λ=4 for 75 percent of the population, and λ=5 for the other 25 percent. (a) if a person is chosen at random, what is the probability that s/he will have zero accidents in a certain year?
the major cells of the ground tissue are parenchyma cells, which function in photosynthesis and nutrient storage. they have thin walls, many chloroplasts, and large central vacuoles, and they form the mass of most leaves, stems, and roots. another cell of the ground substance is the sclerenchyma cell.
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hair protects us by conserving heat and the hair in the nose and ears protect these organs from dust and other particles