C) 2 /3 parts of a tank contains 80 litre of water. How much water does 3/8 parts of the tank contain?​

45 litres

Step-by-step explanation:

Let the whole tank contains x litres of water.

Therefore,

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0