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En un conjunto de n valores de la variables X se sabe que: a. n Xi = 10 i=1 n X 2 i = 260

En un conjunto de n valores de la variables X se sabe que:

a. n Xi = 10

i=1

nX2i = 260

i=1

S2=25 halle n

b. n Xi = 140

i=1

n Xi2 = 1360

i=1

nS2=1280 halle n

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