What Do These Rhythm Of Pulse Rate Indicate?

Thank you, I take manual vitals in a medical office and have two questions. 1: taking the pulse of a client last week I counted 76 beats per minute and was told afterwards that she had a pacemaker set at 70. Did I err? I charted my number because that s what I got. 2: While doing a manual BP this morning I could hear rhythmic systolic sounds from 150 to 140, but below 140 they became MUCH more pronounced in volume and continued down to 72mmHg. The sounds I was hearing at 140 to 150 were not aberrations, they were rhythmic heart beats that were synchronous with the later sounds that I heard for the rest of the reading. How do I interpret this? I m a CNA1 we didn t go into so much detail in our training