Answer:
The missing probability p = 0.22.
Step-by-step explanation:
A fully charged cell is composed of nickelic hydroxide in a NiCd battery.
Nickel is known to be such an element that it has multiple oxidation states.
The proportions of the states are given as following.
X p(X)
0 p
2 0.23
3 0.35
4 0.2
The total probability of an event, which in this case, is the event that Nickel has oxidation states of either 0, 2 , 3 or 4, is always equal to 1.
Therefore we can write p + 0.23 + 0.35 + 0.2 = 1
Therefore p = 1 - (0.23 + 0.35 + 0.2) = 1 - 0.78 = 0.22
The missing probability p = 0.22.
