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P(A) = 0,4;
P(B') = 0,2 ⇒ P(B) = 1 - P(B') = 1 - 0,2 = 0,8
P(A∨B) = 0,9
P(A∨B) = P(A) + P(B) - P(A∧B)
P(A∧B) = P(A) + P(B) - P(A∨B)
P(A∧B) = 0,4 + 0,8 - 0,9 = 0,3
Odp.: C. P(A∧B) = 0,3
ZADANIE 25
2 - 1 osoba
3 - 4 osoby
4 - 3 osoby
5 - 2 osoby
2, 3, 3, 3, 3, 4, 4, 4, 5, 5
↑ ↑
Me = (3+4) / 2 = 7/2 = 3,5
Odp.: B. 3,5