Cho X là biến ngẫu nhiên rời rạc có bảng phân phối xác suất x 1 2 3 4 5 6 7

P a 2a 2a 3a a² 2a² a(7a + 1)

a. Xác định tham số a.

b. Với a tìm được, tính P(X≥4).

c. Tìm kỳ vọng và phương sai của X.

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1

$97520

step-by-step explanation:

add 6% to the value she got from selling the house.

heudhduxhdnshenebdutbbt

step-by-step explanation:

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percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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