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What is the mean and standard deviation of the number of school age children per family in Whitehall?
Number of children: 0, 1, 2, 3, 4, Percentage of families: 40, 30, 15, 10, 5, there are 500 units. calculate how many children?
X = 0 1 2 3 4 P (X = x) = 0.4 0.3 0.15 0.1 0.05 is, E (x) = (0 x 0.4) + (1 x 0.3) + (3 x 0.15) + ( 4 x 0.05) E (x ^ 2) = (S ^ 2 x 0.4) + (x ^ 1 2 0.3) + (9 x 0.15) + (16 x 0.05) E (x) ^ 2 = (square of the mean) variance = E (x ^ 2) - E (x) ^ 2 = deviation from the root of the rate change or to say please thx!
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