Cho bảng phân phối xác suất của biến ngẫu nhiên hai chiều (X, Y) như sau: Y X 1 2 3
0 m 0,3 0.05
1 0,2 0,15 0,1

1/ Tìm m ?
2/ Tính P( X+Y=1)=?
3/ Tìm E (X) = ?

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation:

honesty mood

step-by-step explanation: