A preponderance means evidence that is more probable, more persuasive, or of greater probative value. It is the quality of the evidence that must be weighed. Quality may, or may not, be identical with quantity. In determining whether an issue has been proved by a preponderance of the evidence, you should consider all of the evidence, regardless of who produced it. If the weight of the evidence is equally balanced, or if you are unable to determine which side of an issue has the preponderance, the party who has the burden of proof has not established such issue by a preponderance of the evidence.
Reasonable doubt is a doubt based on reason and common sense.
Reasonable doubt is not mere possible doubt, because everything relating to human affairs or depending on moral evidence is open to some possible or imaginary doubt. Proof beyond a reasonable doubt is proof of such character that an ordinary person would be willing to rely and act upon it in the most important of his or her own affairs.