The heart rate for puppies are normally distributed with a mean heart rate of 180 beats per minuter (60-160 bpm for most adult dogs) with a standard deviation of 6 bpm.

a. What percentage of puppies will have heart rates of less than 187 bpm?
b. What percentage of puppies will have heart rates between 175 and 187 bpm?
c. If 500 puppies are examined, how many would you expect to have a heart rate of less than 187 bpm?
d. 10% of all puppies will have a heart rate greater than what value?
for part A I got (187-180)/(6)=7/6=1.1667

I need help with part B and C and D?

Question

The heart rate for puppies are normally distributed with a mean heart rate of 180 beats per minuter (60-160 bpm for most adult dogs) with a standard deviation of 6 bpm.

a. What percentage of puppies will have heart rates of less than 187 bpm?
b. What percentage of puppies will have heart rates between 175 and 187 bpm?
c. If 500 puppies are examined, how many would you expect to have a heart rate of less than 187 bpm? 
d. 10% of all puppies will have a heart rate greater than what value?
for part A I got (187-180)/(6)=7/6=1.1667

I need help with part B and C and D?