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AThe following function is probability mass function. f (x) 2x+5 0A5x-0, 1,2,3.4 Determine the mean, μ, and variance, o2, of the random variable. Round your answers to two decimal places (e.g. 98.76)BDetermine the mean and variance of the random variable with the following probability mass function. f (x) - (8/7) (1/2)X, x- 1,2,3 Round your answers to three decimal places (e.g. 98.765) Mean Variance -

CAssume that trees are subjected to different levels of carbon dioxide atmosphere with 8% of the trees in a minimal growth condition at 33 parts per million ppm 11% at 460 ppm (slow growth), 48% at 540 ppm (moderate growth), and 33% at 640 ppm (rapid growth). what is the mean and standard deviation of the carbon dioxide atmosphere (in ppm) for these trees? The mean is ppm. [Round your answer to one decimal place (e.g. 98.7).] The standard deviation is ppm. [Round your answer to two decimal places (e.g. 98.76)1DActual lengths of stay at a hospitals emergency department in 2009 are shown in the following table (rounded to the nearest hour). Length of stay is the total of wait and service times. Some longer stays are also approximated as 15 hours in this table Hours Count Percent 1 12 2.51 2 35 7.32 73 15.27 4 115 24.06 5 74 15.48 6 68 14.23 739 8.16 18 3.77 9 19 3.97 10 12 2.51 15 13 2.72 Calculate the mean and variance for the random variable (length of stay). Round your answers to two decimal places (e.g. 98.76) Mean Variance

can you pls help me with A,B,C,D

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