Is there any reason why a jury convicted a defendant of murder by reason of premeditation rather than felony?

[30 Cal.3d 851] Defendant contends that despite the foregoing evidence of premeditation we must reverse the murder convictions because it is possible the jury based its verdict on the felony-murder theory, relying on an alleged attempted robbery that defendant asserts is unsupported by the evidence. (See People v. Green (1980) 27 Cal.3d 1, 69, 164 Cal.Rptr. 1, 609 P.2d 468.) The record reveals to a virtual certainty, however, that the jury found premeditation rather than felony murder.