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sigma 1.4 50

Posted on Wednesday, September 1, 2010 in lenses

sigma 1.4 50
Chance of questions that include a?

Four buses traveling to a protest march with a total of 25, 50, 25 and 55 students respectively. Among all these students, one (call him Pat) is chosen at random and let X = number of people on the bus Pat. Search (2 decimals) var (X). This is what I tried do. I said the probability that Pat be on any given bus is 1 / 4. Then I said: X can take values of 24, 49, 24 and 54 (the number of people on the bus no pat). With this information I can find the average number of people is 37.75. Then apply the formula, sigma (1-4) (xi – mean) p (x). This is not going to give the correct answer (but I'm not sure what the correct answer is supposed to be).

the probability that any student is given a particular bus, NO is 1 / 4 P bus [1] = 25/155 = 5.31 P bus [2] = 50/155 = 10.31 P bus [3] = 25/155 = 5.31 P bus [4] = 55/155 = 11.31 rework calculations using these probabilities

CANON 7D HD + sigma 50/1.4


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