Question

The mean of the numbers obtained on throwing a die having written 1 on three faces, 2 on two faces and 5 on one face is
(A) 1
(B) 2
(C) 5
(D)$\frac{8}{3}$

Answer 1

Answer:

Mean = 2

Step-by-step explanation:

Three faces has 1

two faces  has  2

One face has  5

Total Faces = 6

Probability pf 1 = 3/6  = 1/2

probability of  2  = 2/6 = 1/3

Proability of 5  = 1/6

X        P(X)      X * P(X)

1          1/2        1/2

2        1/3         2/3

5         16         5/6

1/2 + 2/3  + 5/6

= (3 + 4 + 5)/6

= 12/6

= 2

Mean = 2