The odds against (not E) are 63:37
Probability is the number of an event happens or favorable outcomes/otal number of outcomes.
Upon saying that:
For 63 to 37 odds, we have:
• Probability of E = 37/100
,
• Probability of not E = 63/100
,
• Probability of E = 0.37 or 37%
,
• Probabiility of not E = 0.63 or 63%