Suppose That the Distribution of Heart Rates for Medium-Sized Dogs

Multiple Choice

Suppose that the distribution of heart rates for medium-sized dogs is Normally distributed with mean 115 beats per minute and standard deviation 18 beats per minute.
Stacy takes her medium-sized dog, Scooter, to the veterinarian for a wellness check and learns that Scooter's heart rate is 126 beats per minute. What is the approximate standard score for Scooter's heart rate?

A) -0.6
B) 0.6
C) 7
D) 11
E) 18