
287 S.E.2d 887 (1982)
STATE of North Carolina,
v.
James Lamar FOX.
No. 139A81.
Supreme Court of North Carolina.
March 3, 1982.
*889 Atty. Gen. Rufus L. Edmisten by Asst. Atty. Gen. Joan H. Byers, Raleigh, for the State.
Robert L. Gunn, Pittsboro, for defendant-appellant.
COPELAND, Justice.
Defendant brings forward five assignments of error for our review which concern the admission of his inculpatory statements, the propriety of the District Attorney's argument to the jury, and the correctness of the trial court's recapitulation of the evidence in its instructions to the jury. After a thorough and careful consideration of defendant's contentions, we conclude that he received a fair trial free from prejudicial error.
Defendant first argues that evidence of his pre-trial confessions to the charged crimes should have been suppressed. We disagree. Upon defendant's pre-trial motion to suppress his inculpatory statements, the trial court found inter alia that defendant was fully advised of his constitutional rights three times, that he acknowledged his understanding of those rights on each occasion, that he voluntarily elected to forego his privileges and signed the required waiver forms, and that he seemed coherent and sober during his interrogation and conversation with the various police officers. Defendant did not except to any of the trial court's findings of fact in its order denying the motion to suppress. Nevertheless, he now maintains that the trial court's findings were erroneous because no evidence was adduced at the hearing which tended to show that defendant knowingly and intelligently waived his constitutional rights. The state of the record on appeal precludes our consideration of this contention. Defendant has failed to include in the record the substance of the testimony presented to and heard by the trial judge at the suppression hearing. All we have before us is the judge's final order upon the matter. It is plain that we cannot engage in speculation and assume error in the suppression ruling when no aberration can be fairly and affirmatively ascertained from the record.
[I]t is well recognized that a silent record supports the presumption that the proceedings in the court below were regular and free from error. State v. Mullis, 233 N.C. 542, 64 S.E.2d 656. Further, it was the duty of the defendant to see that the record was properly made up and transmitted, and when the matter complained of does not appear of record, defendant has failed to show prejudicial error. State v. Childs, 269 N.C. 307, 152 S.E.2d 453....
State v. Cutshall, 278 N.C. 334, 346, 180 S.E.2d 745, 752 (1971) (citation omitted). Presuming then, as we must in this case, that the trial court's factual findings, supra, were supported by competent evidence, we are also compelled to conclude that those findings adequately supported the corresponding legal determinations that defendant "freely, knowingly, intelligently and voluntarily waived [his constitutional] rights and thereupon made the statements to the officer" on the occasions in which he admitted his guilt.[1] (Emphases added).
In addition, we are not persuaded that the foregoing legal conclusion was deficient in any respect due to the absence of an express factual finding as to the extent and level of defendant's education or intelligence. The trial court found that defendant affirmed his understanding of his rights prior to each waiver. The ability to understand ordinarily implies the possession of *890 the minimal amount of intelligence required for making independent, rational decisions. Nothing in this record indicates that defendant was an exception to this rule or that an issue to this effect was ever raised at the hearing. In fact, defendant presented no evidence whatsoever at the hearing. In these circumstances, we decline to hold that a finding that defendant understood his rights when he waived them was insufficient to support a legal conclusion that defendant knowingly and intelligently executed those waivers.
Defendant next maintains that the district attorney improperly argued his personal beliefs to the jury by insinuating that the people of the county expected a conviction. We find that the statements of the district attorney to which defendant excepted were not reasonably susceptible to such an interpretation. The district attorney was merely thanking the jury for its attentiveness during the trial and expressing additional gratitude to the State's witnesses and the law enforcement officials who assisted in the preparation and presentation of the case. We perceive no transgression in this and hold that such expressions were well within the permissible bounds of jury argument. See State v. Lynch, 300 N.C. 534, 268 S.E.2d 161 (1980); State v. King, 299 N.C. 707, 264 S.E.2d 40 (1980).
Defendant finally argues that the trial court incorrectly summarized certain evidence in its instructions. Defendant has, however, waived his right to complain of the alleged "misstatement" on appeal because he did not make a timely objection thereto at trial and thereby provide the court with an opportunity to correct itself, if necessary, before the jury retired. State v. Jones, 303 N.C. 500, 279 S.E.2d 835 (1981); State v. Monk, 291 N.C. 37, 229 S.E.2d 163 (1976). Notwithstanding this, there is simply nothing to complain about here. The trial judge said in his summary that the evidence for the State tended to show that defendant "told the lady to go with him because he didn't want her to tell on him." This recapitulation of the evidence was fully supported by the testimony concerning defendant's admissions that, after he robbed the store, he told the clerk "you have got to go with me" and that he later "stabbed the victim to keep her quiet and to keep her from identifying him." Record at 89, 91. The assignment of error lacks merit and is overruled.
In sum, our review of the record and defendant's assignments on appeal discloses no error or prejudice requiring a new trial of this matter. Consequently, defendant's convictions are affirmed.
NO ERROR.
NOTES
[1]  We also note that the State's evidence in chief at trial clearly demonstrated the fact that defendant forewent his constitutional protections with a sufficient understanding of the significance of his relinquishments. Indeed, the uncontradicted evidence strongly suggests that defendant confessed in enlightened surrender to the overwhelming reality of being caught red-handed with the instrumentalities and fruits of the crimes so quickly after their commission.
